________ are responsible for cell mediated immunity
a. Natural killer cells
b. Monocytes
c. Cells that mature in the thymus
d. B cells
e. Cells that mature in the bone marrow
C
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A scientist could test how the traits of desert plants are adaptive by ____
a. transplanting individuals that have the trait into moister habitats b. selectively breeding individuals displaying that trait c. conducting straightforward experiments in the desert habitat d. crossing individuals in the desert with individuals in moister habitats e. comparing them to traits in related species from moister habitats
The most vulnerable organisms to the effects of DDT
are a. producers. b. herbivores. c. primary carnivores. d. decomposers. e. top carnivores.
The disease SARS is spread by ______
A. skin to skin contact D. sneeze droplets B. sexual intercourse E. more than one of these C. blood infections
In the process of egg production, one cell produced during meiosis will become the egg, and the other three will become:
A) primary bodies. B) oogonia. C) primary oocytes. D) polar bodies.