Which best describes the role of nitrogen in the human body?
A. Makes energy in cells
O
B. Main ingredient of protein
O
C. Makes up 1.5% of the human body
O
D. Transfers energy in cells

B. Main ingredient of protein

Explanation:

Nitrogen is the main element of protein and enzymes in other words, protein and enzymes cannot be formed without nitrogen. This nitrogen is taken by plants from the soil after fixation. Atmospheric nitrogen fixes by nitrogen fixing bacteria and converts it into nitrates. While human take nitrogen by eating animals and plants.

answer: tributaries flow into rivers.

wetland is a biome that develops when the water gets accumulated in a land exhibiting a huge depression. these form either seasonally or permanently. the water in the wetland comes from rivers, lakes, ocean, flood, rain or other sources. the wetlands includes mangroves, marshes and peatland.

tributaries flow into the rivers develops a wetland because such water will get deposited in the depression and will restrict the original flow of tributary water. hence, water with low drainage current combines with the river water.

it is a

explanation: