Question

Anything that is built or created in an organized manner vein 2. The basic unit of living things cell 3. To perform in the required way structure 4. A blood vessel that carries blood back to the heart function 5. A specific group of organs which work together as a unit system

Answer 1

Explanation:

The first and most basic level of organization is the cellular level. A cell is the basic unit of life and the smallest unit capable of reproduction. While cells vary greatly in their structure and function based on the type of organism, all cells have a few things in common.