Darwin's finches, which live on the Galapagos Islands, are thought to have originally come from mainland South America and were blown off-course in a storm. The large ground finch, Geospiza magnirostris, likely evolved on an island where:

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.

Why are some people more concerned about shark survival than about shark attacks?

What happens to the amount of waste in the pond as the ecosystem ages?