A vascular cylinder consists of cells of the _____
a. exodermis d. xylem and phloem
b. endodermis e. endodermis, xylem and phloem
c. root cortex f. all of these
E
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From which chamber of the heart does the right ventricle receive blood?
a. right atrium. b. left atrium. c. left ventricle. d. none of the above.
During a controlled experiment, a scientist isolates and tests
A) a control group. B) a conclusion. C) a single variable. D) a mass of information.
__________ is a field of study concerned with the origins, evolution, and persistence of life on Earth as it relates to life in the universe.
Fill in the blank(s) with the appropriate word(s).
Match the correct case study in conservation biology with its animal.
A. fruit bats-introduction of new species B. whales-pollution C. prairie chickens-loss of genetic diversity D. Lake Victoria cichlids-loss of habitat E. songbirds-introduction of new species