Which group in an ecosystem performs photosynthesis?

How do chloroplasts set plants apart from other living things

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.

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.