A catastrophic event that causes many different species to disappear in a short period of time is known as a

A. macroevolution.

B. punctuated equilibrium.

C. mass extinction.

D. background extinction.

Susan germinated a seed and watered the growing plant regularly. The plant produced flowers in the second year and died. Which type of plant could it be? annual bienni perennial

Gradually moving into a hamstring stretch and holding it for a short period is known as stretching.

The female sex cells of a flowering plant are contained in its a) pistil b) pollen c) zygotes d) seeds

The American buffalo has cells containing 60 chromosomes. If one germ cell if a female bison undergoes meiosis, how many chromosomes could be found in the resulting egg.

The study of the Earth's magnetic field is known as

Alicia is being aggressively tickled by her older sister. which divisions of the nervous system are involved in processing the nerve signals

In this biome you will find many evergreens tree. They don't lose their leaves and they are triangle shaped so their branches won't hold snow and break. This biome is found in Canada and Russia what biome is this?

The drought alone did not cause the dust bowl. It was combination of several things, the drought and

Ecology is made up of

Why does a temperature inversion trap smog and prevent it from dispersing