Leukopenia is a condition characterized by a decrease in white blood cells. what effect does leukopenia have on the body's ability to fight infection?

1 leukopenia increases the body's ability to fight infection.
2 leukopenia decreases the body's ability to fight infection.
3 leukopenia has no effect on the body's ability to fight infection.
4 leukopenia increases the body's ability to fight infection at certain times and decreases it at other times.

Which of the following statements is true of enzymes? a)they dont provide an active site for substrates to bind in a reaction b)they act on a specific type of substrate in a reaction c)they unusable after a reaction d)they change shape after a reaction

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.

Casts and mold are a type of preservation where the original material decays, leaving a mold in surrounding rock that can be filled with another sediment a. true b. false