Answer:
The correct answer is option A, that is, astrocytes.
Explanation:
Glial cells or the glia refers to the non-neuronal cells in the CNS and the PNS that maintain homeostasis produces myelin, and offer protection and support for neurons. The most prominent type of glial cells in the CNS are astrocytes.
The astrocytes exhibit various projections, which connect neurons with their blood supply and at the same time maintaining the blood-brain barrier.
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Examples of positive and beneficial mutation:
- Antibiotic resistance by bacteria
- Almond tree gene mutation
- Humans immunity to HIV
Examples of negative and harmful mutation
- Cystic fibrosis
- Frame shift mutation
- Cancer
Examples of neutral mutation;
- Bovine and human insulin
- Silent point mutation
- Missense mutation
<h3>What are mutation?</h3>
Mutations are results from change in gene structures that leads to variations in form that can be transferred or passed down to generations. This is usually caused by alterations in the single base unit of DNAs by insertion, deletion or rearrangement of genes or chromosomes.
Positive and beneficial mutations result in retained from of adaptation like antibiotic resistance by bacteria, harmful mutation causes harm such as cancer, while neutral has little or no effect example, silent mutations.
Learn more on mutations here: brainly.com/question/17031191
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Natural selection is an idea that Charles Darwin came up with.
It attempts to describe how animals and plants evolved by using nature as the determiner of who survives. For example, if there is a fast cheetah population and a slow cheetah population in Africa, the slow cheetah population will eventually die out due to them not being able to catch prey to survive. The fast cheetah had the desirable traits necessary for survival in this location. Only the strong survive is helpful to remember when dealing with natural selection.
