As energy flows through an ecosystem, energy as it moves to the next trophic level A. decreases by 10%
B. increases by 90%
C. decreases by 90%
D. increases by 10%

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.

In "the man in the water," what was the remarkable occurrence that rosenblatt reported?

Which of the following is a responsibility of a scientist