Choose each of the following that would be an example of a pollution situation that would contribute to non-point source pollution.

a. improper use of fertilizers on lawns
b. factory waste water discharge into a river
c. disposal of chemicals on roadways
d. smoke stack emissions from a power plant
e. leaky oil pans on automobiles

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.

Identify any four organelles that should be present in the eukaryotic organism and describe the function of each organelle

Under the soviet system, the government a. controlled all forms of communication. b. allowed newspapers to print whatever they wanted. c. controlled editorials but not the reporting of news. d. encouraged access to a wide variety of news sources. select the best answer from the choices provided a b c d