Answer:
a steep temperature gradient in a body of water such as a lake, marked by a layer above and below which the water is at different temperatures.
Explanation:
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The first known single-celled organisms appeared on Earth about 3.5 billion years ago, roughly a billion years after Earth formed. More complex forms of life took longer to evolve, with the first multicellular animals not appearing until about 600 million years ago.
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#5- Proteins
#6- is incorrect the answer is-->> ATP synthesis
#8- Photosynthesis
#9- Cell recognition components
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Answer:
D. Discrimination
Explanation:
Discrimination is the correct answer.
