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dem82 [27]
3 years ago
5

Simple, prokaryotic organisms have been on Earth for over 3 billion years and have been able to grow and evolve into many differ

ent and successful prokaryotic organisms. Which structure evolved in cells approximately one billion years ago that allowed for the forming of more complex, multicellular organisms?
A) nucleus

B) ribosome

C) plasma membrane

D) golgi apparatus
Biology
2 answers:
mrs_skeptik [129]3 years ago
6 0

A) The nucleus is the answer

astraxan [27]3 years ago
6 0

Answer:

The correct answer is option A: the nucleus, a fundamental part of the eukaryotic cell.

Explanation:

Hello!

Let's solve this!

First we will analyze what each of the structures is.

A) nucleus: main structure of a eukaryotic cell. The nucleus contains the DNA inside.

B) Ribosome: they play a fundamental role in protein synthesis.

C) plasma membrane: it is the membrane that surrounds the cell. It is semipermeable, it means that it lets in some substances that are good for the cell and does not let harmful substances pass.

D) Golgi apparatus: helps the synthesis of lipids.

After the analysis, we conclude that the correct answer is option A: the nucleus, a fundamental part of the eukaryotic cell.

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A food chain describes who eats whom in the wild. Every living thing – from unicellular algae to giant blue whales – needs food to survive. Every food chain is a possible pathway that energy and nutrients can travel through an ecosystem. The primary productivity of the grass is 200 units. There is a 10 fold decrease in the amount of energy units as we move upwards in production chain. So from grass to rabbits we lose energy. The foxes will only really have two units once it's decreased by 10 fold again. The grass does not get any energy from the decaying bodies of foxes, they get the minerals that they need to grow.  And so the correct answer to this question is 0 units because when the energy gets recycled from fox trophic level back to the grass trophic level it will be totally reduced.

Note: The question seems to be incomplete. So the complete question is "Consider a hypothetical food chain consisting of grass, rabbits, and foxes. The primary productivity of the grass is 200 units. What is the maximum amount of energy that we should expect to be recycled from the fox trophic level back to the grass trophic level? Answer choices: A) 0 units B) 0.2 units C) 2 units D) 20 units"

Learn more about food chain on:

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