Answer:
Read explanation.
Explanation:
Like plants, animals also need food for their bodies. But they can't produce their own food. They have to depend on others for food purposes. After eating anything, that don' t go their cells directly. It passes many stages; then, they go the cell as a fuel. From eating to consuming by the cell, many digestive processes happen, such as the degradation of larger molecules to small molecules. Many chemical reactions also occur to covert elements to that form, which can be taken by cells as fuel as the reaction in mitochondria.
This way, men and animals get food as their fuel.
Topsoil is the most fertile soil layer for plants.
That would be the Thymus Gland.
