Certain preparations contain killed or weakened live biological agents that, upon injection into our body, protect the body against those pathogens. what are these preparations called? a. vaccines b. enzymes c. t cells im on my very last plato test

Is a measure of the different types of organisms in a community. question options: tertiary secondary primary none of the above

Methane gas created by a cows flatulence especially in a large herd is a greenhouse gas. true or false.

Which of the following may one conclude from a map that shows the average ph value of rainfall in the u. s.? acid rain is a more serious problem on the east coast. acid rain falls equivalently across the continental u. s. there are more factories on the west coast. the midwest has fewer forests than the rest of the u. s.