Answer: a. A shared ancestral character.
Explanation:
A shared ancestral character is the character or feature that two lineages of same or distinct species have in common derived from a common ancester. The four limbs in birds and mammals is the example of this.
They are also called "Land Plants" that are non-vascular!
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I think the correct answer would be option 1. It is the marine life in the Arctic circle that is most affected by the extinction. It was estimated that about 40% of the endangered animals of this part are in extinction. This is because of climate change and the destruction of their homes. Also, scientists say that the temperature change of this area is increasing rapidly as compared to the rest of the world which means the animals would have to adapt to these conditions and while some can adapt easily, there are those that cannot and would die to extinction.
The gray matter of the two halves of the thalamus is divided by a vertical sheet of white matter called the internal medullary thalamus.
On cross sections of the thalamus, layers of myelinated fibres are seen as medullary laminae. They are also known as medullary layers of the thalamus or laminae medullares thalami. The thalamus is divided into lateral, medial, and anterior regions by the internal medullary lamina, a thin, vertical strip of white matter that bifurcates in its anterior portion.
The intralaminar nuclei are enclosed by the laminae medullaris medialis (interior medullary lamina), which is located between the dorsomedial and ventral nuclei of the thalamus (centromedian nucleus, paracentral, and central lateral).
Therefore, gray matter of the two halves of the thalamus is divided by a vertical sheet of white matter called the internal medullary thalamus.
Learn more about internal medullary thalamus here;
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