NEET BIOLOGY

Detailed explanation-1: -Individual organisms can evolve during a single lifespan. Evolution only occurs slowly and gradually. Because evolution is slow, humans cannot influence it. Genetic drift only occurs in small populations.

Detailed explanation-2: -Charles Darwin understood that evolution was a slow and gradual process. By gradual, Darwin did not mean “perfectly smooth, ” but rather, “stepwise, ” with a species evolving and accumulating small variations over long periods of time until a new species was born.

Detailed explanation-3: -Evolution is a gradual process in which something changes into a different and usually more complex or better form. The mechanisms of evolution include natural selection acting on the genetic variation among individuals, mutation, migration and genetic drift.

Detailed explanation-4: -Indeed, over a long period of time, genetic drift and the accumulation of other genetic changes can result in speciation, which is the evolution of a new species.

Detailed explanation-5: -Evolution is a gradual and continuing process of change that occurs over a period of time, due to slight variations in genetic compositions as well as changes in environment, leading to formation of new species.