Nitrogen fixation is really important because it takes the free nitrogen out of the atmosphere and puts it in a form more readily absorbable for plants. What type of organisms carries out nitrogen fixation?

A. Decomposers
B. Nitrogen
C. Plants

(If anyone wants to help me with my entire bio final exam please help!!!)

Which kind of aquatic ecosystem does the photograph most likely show? a. marsh b. swamp c. lake d. river

What is thought to have caused the mass extinction at the end of the cretaceous period?

How is the national wildlife refuge system similar to the pacific region coastal program? a. both programs are concerned with providing habitats for wildlife b. both programs are primarily concerned with preserving fish species c. both programs have set aside 150 million acres of land d. both programs are under the u. s. fish and wildlife service