Answer: Option B
Explanation:
The upper forelimbs of human beings and bats have similar skeletal structures but the same structure has resulted differently in whales.
This is because the natural selection in whales has resulted in change in anatomy and this change in whales has changed their anatomy.
The forelimbs of whales has changed into flippers and it helps whales in swimming.
The forelimbs of human beings, whales and bats have the common ancestors but because of different environment they evolved differently.
Cellular respiration is the process in which water and carbon dioxide are waste products.
Elephants, who are important grazers, are instrumental in transforming woodlands into grasslands. This has a tremendous impact on other species that depend on the grass for their survival. The significance of the elephant in this example is B. keystone species.
Answer:
The very first DNA isolation was done by a Swiss physician, Friedrich Miescher in 1869. He hoped to solve the fundamental principles of life, to determine the chemical composition of cells.
