Which of the following scenarios is representative of commensalism?
a.
tapeworms living in a mammal’s intestinal tract
b.
bees pollinating flowers
c.
birds following grazing animals who stir up insects
d.
clown fish living among sea anemones

Which is an advantage of having memory cells when a pathogen is encountered for a second time. a) the memory cells are what proliferate into clones of cells in response to the binding of an antigen. b) memory cells are vital to the primary immune response in that they immediately recognize pathogens even at the first encounter. c) memory cells are essentially effector cells that are short lived and attack antigens even without having a receptor specific to that antigen. d) it ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.

For this question look at the hydropic diagram water that is heated by the sun evaporates. select the number that represents it.

Which of the following is the most likely outcome of global warming