Question

1. what is the most basic, living level of biological organization?

tissue
organ system
organ
cell

Explanation:

To determine the most basic living level of biological organization, we analyze each option:

• Tissue: Composed of cells, so not the most basic.
• Organ System: Composed of organs, which are made of tissues and cells, so not basic.
• Organ: Composed of tissues, which are made of cells, so not basic.
• Cell: The cell is the fundamental unit of life. All living organisms are made up of cells, and cells are the smallest structural and functional units that can perform all life processes. So the cell is the most basic living level of biological organization.

Answer:

D. Cell (assuming the options are labeled A to D with D being Cell; if the original options have different labels, adjust accordingly, but based on the given options, the correct one is Cell)