Spheres of Earth Answers

The animal releases the carbon dioxide back into the atmosphere during respiration.

The animal eats a plant and uses its carbohydrates for energy.

The cycle repeats when the carbon stored in the atmosphere as carbon dioxide gas is taken in.

X Carbon cycleNitrogen cycle✔ Phosphorus cycle This nutrient is cycled between living things and the soil. Plants absorb this nutrient from the soil and turn it into organic compounds through assimilation. Animals eats the plants and pass the nutrient through the food chain from one organism to another. When the animal dies, it decomposes and returns the nutrient back to the soil. The nutrient can also enter the soil through weathering and erosion.

✔ Carbon cycleX Nitrogen cyclePhosphorus cycle Plants take in this nutrient when they perform photosynthesis. An animal eats the plant and uses its carbohydrates for energy. The animal releases the nutrient back into the atmosphere during respiration.

78% of Earth’s atmosphere contains this nutrient in the form of gas. All living things require this nutrient to make proteins, and it is found in the waste products of many living things.

Step 1: Bacteria, through nitrogen fixation and nitrification, convert nitrogen into a usable form.Step 2Step 3✔ Step 4 The animal dies and decomposes, returning nitrogen back to the soil.

Step 2Step 3X Step 4 Once nitrogen is in usable form, it is taken up by plants and assimilated into proteins..

Step 1: Plants absorb phosphates in the soil and turn them into organic compounds through assimilation.Step 2Step 3Step 4 Animals eat these plants and pass the phosphorus through the food chain.

Step 2Step 3Step 4 An animal dies and decays, returning the phosphorus to the soil, and the cycle repeats.

Carbon cycleNitrogen cyclePhosphorus cycle Bacteria in the soil converts this nutrient into a usable form. Plant take up the usable nutrient through the soil and assimilate it into proteins, making it part of the plant. An animal eats the plants, and the nutrient becomes part of the animal. When the animal dies, it decomposes, returning the nutrient back to the soil.

This nutrient is not abundant, but it is essential to life. It is part of DNA and RNA and a component of bones and cell membranes.