specialized
all living things, including animals, plants, and single-celled life forms
structure
contract
able to perform one special task or function
muscle
the way all the parts of something fit together
organisms
a condition that keeps an organism from working as it should
cells
a part of the body that causes movement by contracting and relaxing
framework of bones of a human or other animal body
the smallest living parts of organisms
disease
to shorten
skeleton
