Question

how the animals obtain their carbon requirement​

Answer 1

Answer:

When animals eat food, they get carbon in the form of carbohydrates and proteins. ... The carbon combines with oxygen to form carbon dioxide (CO2) and is released back into the atmosphere as a waste product when animals breathe and exhale.

how do animals obtain nitrogen

Plants take up nitrogen compounds through their roots. Animals obtain these compounds when they eat the plants. When plants and animals die or when animals excrete wastes, the nitrogen compounds in the organic matter re-enter the soil where they are broken down by microorganisms, known as decomposers.

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