The process in which nitrogen is taken out of the atmosphere and assimilated into organic compounds in the soil is called? *
A. nitrification
B. denitrification
C. nitrogen cycling
D. nitrogen fixation

Which group of algae is characterized by unicellular organisms and includes some members that would be better classified as zooflagellates? euglenophytes red algae sporozoans green algae

What drives an advertising campaign?

An ecologist studied the same species of deer during the summer and the winter. she noticed that during the summer, when there was plenty of food, the deer were energetic and playful. however, during winter when food was scarce, the deer moved more slowly and did not run unless they needed to escape a predator. which scientific fact is best supported by her observations?