The atmosphere contains a large amount of nitrogen in a form that cannot be used by plants and animals. Which is a form of nitrogen that plants and animals can use.
A. Trees convert nitrogen into bacteria which makes it useful
B. bacteria release nitrogen into the atmosphere
C. bacteria change nitrogen into nitrates
D. animals fix nitrogen into ammonia which is used by plants

Q1.8. continuing your studies, you perform a transplant experiment. you chisel up multiple rocks from the upper intertidal zone, each holding 10 individuals of species a, and move them to the lower intertidal zone among individuals of species c. you count the number of individuals of all species on the rocks every day for 30 days. based on your findings, what can you conclude? (remember that all 3 species settle in this zone at equal rates.)

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

Differentiation of cells changes the nucleic information. true false