What is an electron orbit (energy level) ?

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

Explain how organisms could be harmed by high levels of salt from roadways?

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.