Nitrogen-fixing cyanobacteria are critically important ecologically.

true or false?

See Explanation

Explanation:

Yes, this is true because some bacteria in our environment tends to either fend off of or kill other types of bacteria. In this case, this bacteria is helpful because it turns gaseous nitrogen into a form that can be absorbed and used by plants in our environment.

the answer is c) an oak tree

there’s no image attached but i can if you want: )