Question

multiple choice question the basic unit of life, and the biological level at which the properties of life are first observed, is the _blank cell. atom. molecule. tissue.

Explanation:

In biology, the cell is defined as the basic unit of life, and it's the first level where life properties (like metabolism, reproduction) are observed. Atoms and molecules are non - living, and tissues are made of cells (so not the basic unit).

Answer:

A. cell