Which statement is true?
A) The diversity of life has depended on similar environments and ecological communities around the globe.
B) Sexual selection and genetic drift contribute to the diversity of life.
C) Earth has existed and changed over a few thousand years, at most.
D) All ancestral forms of life were very similar to organisms that currently exist.
E) All organisms are closely related genetically.

Question

Quizplus · Accepted Answer

Sexual selection and genetic drift are two important mechanisms of evolution that can lead to the diversification of life. These mechanisms can cause genetic differences to accumulate within populations, which can eventually result in the formation of new species.

Answer: None of the other answer choices are true. 
 A is incorrect because the diversity of life has also depended on unique historical events, such as mass extinctions and geographic isolation. C is incorrect because Earth is estimated to be around 4.5 billion years old, and has gone through numerous changes over that time. D is incorrect because the ancestral forms of life were vastly different from modern organisms, and have evolved over billions of years. E is incorrect because while all life shares a common ancestor, there is significant genetic variation between different groups of organisms.

Which Statement Is True