Ais a substance or a cgemical compound required by the animal for these productive purposes

A nutrient is a substance or a chemical compound required by the animal for these productive purposes .

Explanation:

Nutrients are essential compounds and macromolecules needed for a variety of metabolic processes.  Animals show heterotrophic nutrition by consuming organic matter like lipids, fats, and proteins.

Food provides essential vitamins, amino acids and minerals that are used as cofactors and coenzymes in chemical reactions.

For example, animals use carbohydrates as fuel for all metabolic processes.

C6H12O6+ 6 O2 → 6 CO2 + 6 H2O + ≅38 ATP

i think its control and coordinate because im pretty sure thats what tissue does and the joints are what control movement and then your skeletal/ bones provides portection. hope that .

answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation: