Nitrogen in the atmosphere must be "fixed" before it can be used by plants. Atmospheric nitrogen is "fixed" by

The total number of species in an area is termed? a.) species richness b.) species abundance c.) species evenness d.) genetic diversity

You tried to give 2 breaths to an unconscious choking infant, but the air did not go in. you repositioned the head and reattempted 2 breaths. the air still did not go in or make the chest rise. what should you do next?

Ape species began to dwindle during the Miocene, leaving only a few remaining: a situation that exists up to the present. It is thought that the number of ape species reduced at that time because

What might happen if plants could not perform photosynthesis

Process by which our sensory receptors and nervous system receive physical energy (raw signals) from the environment

If a plant has both male and female reproductive organs it is: a) Monoecious. b) Dioecious.

Earth's tectonic plates A. move in similar ways today as they did in the past. B. can move up and down but not sideways. C. didn't start moving until the 21st Century. D. moved only during Earth's earliest period of history.

Why is taking vitamin c ineffective at enhancing iron absorption from standard iron supplements?

5. If the pressure exerted on a gas in a flexible container is increased does the density of the gas change? Why or why not? Explain your answer

What is the role of cellular reproduction in maintaining genetic continuity