These photosynthetic protists produce one third of the Earth’s oxygen that is generated through photosynthesis.
A) algae
B) moss
C) paramecia
D) protozoans
Answer:
A
Explanation:
this is because these photosynthetic protists have chlororphyll which is capable to make their own food materials through photosynthesis
Which of the following is true about the sun's radiation? It is long-wave. It is short-wave. 40 percent is reflected by the atmosphere. 60 percent reaches Earth's surface. None of the rays are harmful.
Answer:
it's long wave, 40% is reflected by the atmosphere, 60% reaches Earth's
Explanation:
Which of these statements best describes the connection between biodiversity and evolution?
The more biodiversity an area has, the greater the chances of new species arising.
If biodiversity is high, then more predation will take place, preventing species from evolving.
Without a lot of biodiversity, organisms are more likely to survive, so they have more time to adapt.
Evolution depends upon low biodiversity to keep population sizes down, which increases numbers of genes.
Answer:
I believe the answer is c
Explanation:
Many animals have beneficial traits that help them survive their environment. How do these traits develop in organisms?
Answer:
Natural selection allows these traits to develop in organisms to help them survive their environment.
Explanation:
Is the following statement true or false:
It takes the same amount of time for the moon to rotate on its axis as it takes it to complete a revolution around the earth.
QUICK AND EASY FOR SOME POINTSSSSSS
______________ is the name for the process of clearing natural vegetation and replacing it with concrete and buildings
Answer:
it’s b
Explanation:
Scientists have discovered an organism with the following characteristics:
• multicellular
• needs to eat food
• has a complex nervous system
• is able to move from one location to another
• growth occurs throughout its body
In which kingdom is this organism most likely to be classified?
Animalia
Bacteria
Fungi
Plantae
No
Answer:
Animalia
Explanation:
...................
Plants that are grown from undifferentiated cells of leaves, stems, or roots are produced by
A) fusion of spores
B) vegetative propagation
C) sexual reproduction
D) fission of gametes
Please help its due in two hours.
Which one of these happens in an 11 year cycle?
Coronal Mass Ejection
Prominences
Solar Flares
Sun Spots
Answer:Solar flares
Explanation:
Answer: Solar Flares
Explanation: The Sun's magnetic field goes through a cycle, called the solar cycle or known as solar flares. Every 11 years or so, the Sun's magnetic field completely flips. This means that the Sun's north and south poles switch places. Then it takes about another 11 years for the Sun's north and south poles to flip back again.
The picture below shows one way that humans and mosquitoes interact.
What is the best classification of this relationship?
A.parasitism
B.competition
C.commensalism
D.mutualism
What powers the protein ATP Synthase?
A. light
B. glucose
C. NAPH
D. H+
please help
On the date chart above the hight and low tide depths were recorded every coupl days. Looking specially at February 14th what type of tide is occurring? What moon phase would possibly occur on this date
Answer:
Explanation:um I don't really know full moom?
Stephan’s mother is a mineralogist, and sometimes she brings home samples to study. Stephan observesand compares these minerals. He knows minerals form in several ways. He is especially interested in the minerals that form from volcanic activity and the kinds of crystals they form. What determines crystal size in minerals formed by lava or magma?
A. the kind of mineral that formed
B. the amount of material available
C. the rate at which the minerals cooled
D. the materials in the lava or magma
The rate at which the minerals cooled determines the crystal size in minerals formed by lava or magma. The correct option is C.
What determines crystal size in minerals?The solution is extremely saturated with some minerals, crystals form as magma cools. The crystals are quite tiny because they did not have much time to form if the magma cooled quickly. The crystals have ample time to form and become huge if the magma cools gradually.
The rate at which the minerals cooled Crystal size in minerals formed by lava or magma is primarily determined by the rate at which the minerals cooled.
When lava or magma cools slowly, it allows crystals to grow larger. Conversely, when it cools rapidly, crystals have less time to grow and thus remain smaller.
Therefore, the correct option is C.
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Explain two ways in which forecasters collect weather data and how it's used
Answer:
thermostats
Explanation:
Answer:
Various instruments measure weather conditions: thermometers measure air temperature, and barometers measure air pressure. Satellites monitor weather from above. Radar is used to monitor precipitation
Explanation:
your answer is underlined
Answer the following questions in complete sentences in the space provided:
1. Why does cell division take place in single-celled organisms?
2. What occurs in a cell when it is not undergoing cell division?
3. How do chromosomes change before cell division?
4. What is mitosis?
5. Why doesn’t mitosis occur in prokaryotes?
6. What would happen if DNA did not duplicate during interphase?
7. What is cytokinesis and when does it happen?
8. During what phase of mitosis do the chromosomes line up?
9. When do the chromosomes condense and become visible under a microscope? 10. What happens to the chromosomes during anaphase?
11. Sometimes a cell inaccurately duplicated its DNA, and the resulting cells are not identical. What effects might such a change have on the organism?
Answer:
1.All multicellular organisms use cell division for growth and the maintenance and repair of cells and tissues. Cell division is tightly regulated because the occasional failure of regulation can have life-threatening consequences. Single-celled organisms use cell division as their method of reproduction.
2.What happens to cells that "decide" not to divide? If the decision is to not divide, the cell goes into a quiescent, or nondividing state, called G0 (G zero).
3.Prophase is the first phase of mitosis. During this phase, the chromosomes inside the cell's nucleus condense and form tight structures. In fact, the chromosomes become so dense that they appear as curvy, dark lines when viewed under a microscope (Figure 1).
4.Mitosis is a process where a single cell divides into two identical daughter cells (cell division).
5.In bacterial cells, the genome consists of a single, circular DNA chromosome; therefore, the process of cell division is simplified. Mitosis is unnecessary because there is no nucleus or multiple chromosomes. This type of cell division is called binary fission.
6.If a cell has not properly copied its chromosomes or there is damage to the DNA, the CDK will not activate the S phase cyclin and the cell will not progress to the G2 phase. The cell will remain in S phase until the chromosomes are properly copied, or the cell will undergo programmed cell death.
7.Cytokinesisis the part of the cell division process during which the cytoplasm of a single eukaryotic cell divides into two daughter cells. Cytoplasmic division begins during or after the late stages of nuclear division in mitosis and meiosis.
8.Metaphase. Chromosomes line up at the metaphase plate, under tension from the mitotic spindle. The two sister chromatids of each chromosome are captured by microtubules from opposite spindle poles. In metaphase, the spindle has captured all the chromosomes and lined them up at the middle of the cell, ready to divide.
9.During prophase, the complex of DNA and proteins contained in the nucleus, known as chromatin, condenses. The chromatin coils and becomes increasingly compact, resulting in the formation of visible chromosomes.
11.When Replication Errors Become Mutations. Incorrectly paired nucleotides that still remain following mismatch repair become permanent mutations after the next cell division. This is because once such mistakes are established, the cell no longer recognizes them as errors.
The picture below shows an ecosystem that has been recently changed by human activity. The change
has impacted native populations living in the area.
Which of the following limiting resources was most affected by this human activity?
A.nesting sites for birds
B.water supply for deer
C.amount of space for trees
D.number of predators that eat fish
Answer is B, hope it helped.
Please help, this is worth 20 points!
When the moon blocks the sun's light, a ____ eclipse occurs.
A. solar
B. lunar
C. partial
D. full
True or False. The arrow labeled C represents a transfer of chemical energy to mechanical energy. Explain why this is true or false.
Lawrence had a most Answer feeling while going up the stairs to the A deck.
A. peculiar
B. extravagant
C. recuperate
How many molecules are in this formula?
hello i need help again
Which group of vertebrates are endotherms and have amniotic egg?
Answer:
birdBipedal, endothermic, tetrapod vertebrate that lays amniotic eggs and has wings and feathers.
Explanation:
what direction is the wind coming from if the tail is going south west?
Light energy travels as -
A: compressional waves
B: primary waves
C: surface waves
D: transverse waves
Answer:
D
Explanation:
Charles Darwin's theory of evolution describes how species evolve due to natural selection. Which of these is NOT evidence of natural selection
Camels have long, bushy eyelashes
Mint plant varieties are crossed to express desirable traits
The snowshoe hare is white in winter and brown in summer
Galapagos finches have stronger beaks after years of drought
Margaret Brown
A. gazed
B. heave
C. descend
into the eyes of the frightened passengers in her lifeboat.
Answer:
A. Gazed
Explanation:
you cant heave or descend into someones eyes. Gazing or looking into someone's eyes makes the most sense.
What results when the air surrounding a bolt of lighting experiences a rapid increase in temperature and pressure .
Answer:
thunder :)
Explanation:
A) How long will it take for 40.0 grams of Radium-226 (Ra-226) to decay to leave a total of 2.5 grams of Ra-226? Ra-226 has a half-life of 1600 years.
B) If there are 80.0 grams of Neptunium-240 (Np-240), how much Neptunium-240 will remain after 4 hours? The half-life of Neptunium-24 is 1 hour.
Answer:
a) 6400 years
b) 5 grams
Explanation:
a) to get 6400 years, the 40 grams is halved 4 times to get to 2.5g and 4 times 1600 is 6400
b) 80 is halved 4 times and the final result you get is 5 grams
80/2= 40/2= 20/2=10/2=5
each divided by 2 represents 1 hour
Answer:
[ A ] 6400 years
[ B ] 5 grams
Explanation:
How does energy move in a healthy ecosystem from the sun to the plants and animals?
Answer:
First,the sun transferes heat to the plants,helping them grow.Animals such as deer who would eat grass,eat plants.
Explanation:
Energy moves from one trophic level, or level of the food chain, to the next as primary producers take energy from the sun to make their own food in the form of glucose.
What is energy transfer?
The sun is the principal energy source for practically all ecosystems on Earth. Energy moves from one trophic level, or level of the food chain, to the next as primary producers take energy from the sun to make their own food in the form of glucose. Primary producers are then consumed by primary consumers, who are in turn eaten by secondary consumers, and so on. The food chain provides the simplest visual representation of this energy transfer.
A new trophic level is represented by each link in the chain, and the arrows depict the flow of energy through the chain. The primary producer is always at the bottom of a food chain. Plants are the most important primary producers in terrestrial ecosystems, whereas phytoplankton is the main primary producer in marine ecosystems. In their respective habitats, each generates the majority of the nutrients and energy required to maintain the rest of the food chain.
Gross primary productivity is the collective term for all the biomass produced by primary producers. After the primary producer has utilized the energy required for respiration, what is left over is what is known as net primary productivity. This is the portion that can be ingested and passed up the food chain by the main consumers.
Therefore, the transfer of energy within the trophic levels results in energy transfer.
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