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Katarina [22]
3 years ago
12

A substance that is in its simplest form that cannot be broken down any further and consists of only one type of atom is a(n)

Biology
1 answer:
olga_2 [115]3 years ago
7 0
The answer is D.) element
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Glial cells called _____ help maintain the blood-brain barrier, whereas _____ create the myelin that envelopes axons. astrocytes
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Answer: Glial cells called ASTROCYTES help maintain the blood-brain barrier, whereas SCHWANN CELLS create the myelin that envelopes axons

Explanation: Glial cells are specialized cell that are found in both central and peripheral nervous systems, that surrounds the neurones, providing them with support and insulation. There are different types of Glial cells these includes:

- Astrocytes: they maintain the blood brain barrier.

- Schwann cells: create the myelin that envelopes axons of the peripheral nervous system neurones.

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prokaryotic cells only

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Euglenas are unicellular organisms. They are both self feeder and other feeders. Which statement summarizes the heterotrophic ac
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The best answer from the list of options is option D (They are colorless and feed on other, smaller cells)

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Euglenas have cells that contain chloroplasts, which means they can make their food like plants through photosynthesis, and when it is dark where they can't get sunlight they can also make food by engulfing their prey through the plasma membrane and absorb them. Euglenas are heterotrophic since they call also feed on smaller cells. Their whip-like tail when viewed under the microscope, is colorless. However, the chloroplasts make them appear green and they can also come in red color.

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