Question

Cyanobacteria produce blank from nitrogen gas as part of the nitrogen cycle.

A) Nitrate
B) Nitrite
C) Ammonia
D) Oxygen

Only about ____ percent of Earth's water is available to be consumed by humans or used for agriculture.
A) 1%
B) 10%
C) 25%
D) 50%

Answer 1

Cyanobacteria produce oxygen as part of the nitrogen cycle. Only about 1% of Earth's water is available for humans or agriculture.

Step-by-step explanation:

Cyanobacteria play a key role in the nitrogen cycle by producing oxygen as part of photosynthesis. They are able to use inorganic sources of nitrogen to fix nitrogen and convert it into usable forms, such as ammonia. This ammonia can then be converted by other bacteria into nitrite and nitrate, which can be used by plants and other organisms.

Only about 1% of Earth's water is available to be consumed by humans or used for agriculture. The rest of the water is primarily found in the oceans, glaciers, and underground.