Phylogeny refers to
a. the evolutionary history of a group of related organisms.
b. a group of organisms that includes an ancestor and all of its descendants.
c. darwin’s method to classify organisms.
d. all of the above

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.

The picture shows a location in india that is very dry and arid. notice the tall mountains in the background; you can find high amounts of vegetation on the other side of the mountains. which statement is most likely true for this area?

Many birth-control pills release a constant amount of synthetic estradiols and progesterone for 21 days. true or false