Answer: parallax is the best answer
A group of cells that performs a similar function is known as tissue.
Answer:
Explanation:
A fox (for example), has more than two arrows pointed towards it.
Because the mouse, rabbit, squirrel, and bird get eaten by the fox.
Because you cannot test it or observe it.
A scientific theory are created through the scientific method, in the scientific method you need to be able observe it and experiment.