6) The human heart is a/n a. cell b. organism _ c. organ

7) The group of organs that work together is called
a. organ system b. roots hair system C. sense organs

8) What is being produced when muscle contracts?
a. Movement b. New organ c. Nothing ​

organ

system

movement

Explanation:

plz mark me brainliest.

6) c 7) a 8)a

Explanation:

Heart is said to be organ under the level of complexity. Heart is a complex composition of tissues

Group of organ that works together is known as organ system

Movement in organisms bring about contraction and relaxing of muscles

c.muti cella's eukaryotic organisms began to diversify