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maw [93]
3 years ago
6

Before organisms with nuclei evolved, life on earth consisted only of unicellular

Biology
2 answers:
Alex777 [14]3 years ago
8 0

C. Prokaryotes

Prokaryotes are unicellular organisms that lack nucleus and other organelles such as mitochondria due to the absence of internal membranes. Furthermore, the cell membrane in prokaryotes is made up of phospholipids which constitute the cells primary osmotic barriers. However, many prokaryotes contain circular DNA molecules commonly refer to as plasmids.

nasty-shy [4]3 years ago
7 0
<span>Prokaryotic is the unicellular organisms that lacks membrane bound nucleus. Eukaryotes have nuclei,fungi, protest are subsets.It is microscopic single celled organisms with distant nucleus.</span>
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The only one of the meninges that follows the brain surface into a cerebral sulcus is the?
Romashka [77]

The pia mater is the only meninges to continue into a brain sulcus after the brain surface.

What are meninges?

The skull and spinal cord are encased in three tiers of membranes called meninges. These are:

  1. The pia mater is the fragile inner layer.
  2. The arachnoid, a fluid-filled web-like structure that forms the brain's intermediate layer, is what gives the brain its cushioning effect.
  3. The dura mater is the name of the hard outer layer.

The term for the three gaps between the meninges-

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The function of meninges:

  1. It acts as a shock absorber, the CNS (central nervous system) will shield our brain from trauma harm, such as a knock to the head.
  2. They secure our central nervous system and prevent our brain from shifting inside our skull.

Therefore the correct solution is an option (A),i.e., pia mater.

The complete question is:

The only one of the meninges that follows the brain surface into a cerebral sulcus is the

a. pia mater.

b. alma mater.

c. dura mater.

d. arachnoid mater.

Learn more about meninges here:

brainly.com/question/7001959

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Arrange the level of cell organization from the simplest to the most complex, with 1 being the simplest and 5 being the
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1. Cell Level

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3. Organ Level

4. System Level

5. Organism

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