One function of the integumentary system is to make vitamin _____.

Seeds can lie dormant for many years.

Groups of cells performing a common function is called a ______.

The opossum is an example of a(n) _____ mammal.

Since the owl is at the top of the food chain we would expect there to be _____.

Fertilizer use will alter the nitrogen cycle balance.     

The shoot system consists of the underground portion of the plant.

Groups of cells performing a common function is called a ______.

Which plant organ is a beet?

A major characteristic of arthropods is _____.