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

A.

the nitrogen cycle

B.

the phosphorus cycle

C.

the rock cycle

What organ would blood clots from the lower legs have to pass through to get to the lungs?

Which group of mammals exhibits the widest distribution and greatest diversity? a.? cetaceans b. monotremes c.? primates d.? placentals e.? marsupials?

What is the maximum amount of time perishable foods can safely be held in the danger zone?

After sunburn the body protects itself by shedding the burnt skin and replacing it with new skin which processor responsible for this defense

True or false? is deep ocean currents caused by the sinking of warm water near the poles?

What characteristics do mutations have?

Primary succession is most likely caused by what?

Strawberry plants typically reproduce by making runners, which are miniature versions of themselves, that grow off of the roots and stems of the parent. This type of vegetative reproduction is known as A) pollination. B) fragmentation.

Is one body system more important than another system?

The moon surface is covered in depressions called craters what caused most of these craters A-activities of tectonic plates B-weathering and erosion by wind and water C-the impact of debris or meteoroids D-the gradual cooling of the moon