Geological change
Both a and b
None of the above
The large rounded brain near the center of the cell is the nucleus. It is known as the brain because it is responsible for most of the cell functions. Similarly to the human brain, the nucleus sends information and instructions to the cell.
a. 3
b. 72
c. 1000
d. 20000
Every year 20,000 species go extinct. Thus, the correct option for this question is D.
Species may be defined as a cluster of organisms that can significantly reproduce with one another in nature in order to produce fertile offspring. It involves identical organisms that interbreed with one another in order to exchange genes. It is responsible for creating fertile organisms.
Species extinction is the ecological force that derives the mechanism of elimination of species from their native environment. This stimulates due to varieties of external influences like lack of food, space, mating selection, involvement of human activities, the action of predators, etc.
So, due to these external influences, it is found in research that approximately 20,000 species go extinct every year.
Therefore, every year 20,000 species go extinct. Thus, the correct option for this question is D.
To learn more about Species extinction, refer to the link:
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