1. which of the following is not a characteristic of life?
a.)maintains homeostasis
b.)composed of cells
c.)composed of atoms
d.)carries out metabolism

The vaccine in a flu shot contains weakened flu viruses. how does a flu shot work with the immune system? a. it destroys lymphocytes. b. it destroys macrophages. c. it activates macrophages. d. it activates lymphocytes.

During convection, less dense fluid rises and denser fluid sinks.

Which skeletal system is represented by the shaded portion of the skeleton? spongy skeleton compact skeleton axial skeleton appendicular skeleton