What is speciation?
a. the way that most species become extinct
b. the process by which new species are formed
c. the adaptations that an organism fit into its environment
d. the mutations that take place in an organism’s dna

The use of dna as evidence in criminal investigations became possible because of the

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.

How does the carbon cycle involve an exchange of carbon