AP BIOLOGY

Detailed explanation-1: -The plants convert the nitrogen compounds into plant proteins and several other organic compounds which build up the body of plants. The plants are then eaten by animals as food. In the animal body, plant protein is converted into animal proteins and other organic compounds which make up their body.

Detailed explanation-2: -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.

Detailed explanation-3: -The nitrogen-containing molecules are passed to animals when the plants are eaten. They may be incorporated into the animal’s body or broken down and excreted as waste, such as the urea found in urine.

Detailed explanation-4: -They feed on plants and obtain nitrogen compounds from them.