How do animals obtain all the necessary components to form amino acids.

Animals get these amino acids by eating plants or animals that eat plants. This works because plants can make all twenty amino acids including the ten or so "essential" ones that most animals can't. ... Animals evolved to work this way because it saves energy.

Explanation:

I don't know if it helped, but try it out!

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 .