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Flauer [41]
3 years ago
13

Which defines background extinction?

Biology
1 answer:
TiliK225 [7]3 years ago
8 0

Answer:

"The natural extinction rate" defines the background extinction

Explanation:

The background extinction rate which is being used for the evaluation of the rate by which the extinction in the earth's geological as well as the biological past took place before the contribution of the human beings as the primary contributors to the extinctions. Extinction happens when the last species of the plants or the animals dies out. This occurs as a result of the climate change or human activity.Background extinction occurs at a steady rate over geological time and is the result of normal evolutionary processes, with only a limited number of species in an ecosystem being affected at any one time.

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What are the structural and functional similarities and differences between mitochondria and chloroplasts?
Sveta_85 [38]

Answer:

Similarities between Mitochondria and Chloroplasts-

Both mitochondria and chloroplast consists of DNA , have two membranes, have fluids inside them and convert energy.

Difference between Mitochondria and Chloroplasts-

They have different number of compartments, have different functions, and are involved in different energy processes.

Explanation:

Difference in Mitochondria and Chloroplasts-

a) Chloroplast is found in plants and unicellular organism and Mitochondria is found  all cells.

b) Chloroplast converts solar energy into chemical energy while Mitochondria converts one form of chemical energy into other form of chemical energy

c) Chloroplast is involved in photosynthesis while mitochondria is involved in cellular respiration.

d) Chloroplast has three parts i) Thylakoid ii) stroma  and iii) granum while mitochondria has three parts i) Critsa ii) Matrix

Similarities between Mitochondria and Chloroplasts-

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4 0
4 years ago
DNA replication occurs during which phase of the eukaryotic cell cycle?
wariber [46]

In eukaryotic cells the DNA can be found in the nucleus mainly. so DNA replication takes place in the nucleus during the S phase of the cell cycle.

Also in eukaryotic cells there are mitochondria and chloroplasts (plants) and these have circular DNA and they also get replicated (according to their own mechanism).

Prokaryotic cells don't contain a nucleus. They do not contain DNA in the cytoplasm and thus the DNA replication will take place here.

I really hope this helps!

3 0
3 years ago
Consider the graph above.notice the trend in atmospheric carbon dioxide as recorded at recording stations over Antarctica.hypoth
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Explanation:

5 0
4 years ago
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8 0
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sashaice [31]

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Explanation:

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3 years ago
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