Phytoplankton play an important role in which of the following biogeochemical cycles?

A.

the nitrogen cycle

B.

the phosphorus cycle

C.

the rock cycle

The organelles that are known as the power plants or the powerhouses of the cell are the?

Ardipithecus ramidus had a small, chimpanzee-like body that was adapted to which condition? a. the heat b. the cold c. the water d. the trees

Pits are large and allow movement of large molecules through tracheids. true or false? salt ions are smaller than bacteria true or false?

What happens to hormone levels during ovulation

All animals are eukaryotes. In a sentence or two, explain what this means.

What is carrying capacity and what does it mean for ecosystems?

Why was the evolution of a coelom a critically important innovation for animals? a) The coelom can act as a hydrostatic skeleton. b) The coelom gives rise to a complex nervous system. c) The coelom made it possible for animals to colonize land.

Marine mammals, with a few exceptions, are a. oviparous b. ovoviviparous c. viviparous

The process by which organ systems maintain a relatively stable internal environment

Which cells in your body contain your entire DNA code? A) Nerve cells only B) Brain Cells Only C) All your cells