What is the basic unit of structure and function in living things?

Tissue is

An organ is

An organ system is a

Which of the following are the levels of organization beginning with the smallest to the most complex?

The heart is an example of

Roots and shoots in a plant work together to form

The stomach, small intestine and large intestine work together in the digestive system. The stomach is an example of

Blood is an example of

The skin is the largest __________ in the body.

A tree is an example of

The respiratory system is an example of