What is causing movement in multicellular organism?

Answer 1

The most common cause of movement in multicellular organisms is chemotaxis. This is a response to stimulation from chemicals.

Answer 2

Movement in multicellular organisms is typically controlled by muscles, which contract and relax in response to nerve signals. This coordinated activity allows organisms to perform functions such as walking, running, and breathing. Hormones and chemical signals also play a role in regulating movement in response to various stimuli.