Use your senses to make an observation about your environment

Nerve cells are specialized to respond to stimulitrue or false?

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

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.