The contractile vacuoles of protozoa are used for
a. Storing nutrients
b. Maintaining optimal levels of water in the cell
c. Production of toxins
d. Motility
Answer: b. Maintaining optimal levels of water in the cell
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True or False: it is likely that the first photosynthetic organisms utilized chlorophyll, demonstrating the ancient origins of modern photosynthesis
A. true B. false
Which characteristic is least applicable to the development of science?
a. evaluation of data b. personal conviction c. prediction d. systematic observation e. sharing of ideas
Fraternal twins (dizygotic) result from the fertilization of
A. two eggs and two sperm. B. two eggs and one sperm. C. one egg and two sperm. D. one egg and one sperm. E. two eggs and one sperm OR one egg and two sperm.
Most plants absorb water and minerals from the ________ and transport them through the ________.
A. atmosphere; xylem B. soil; phloem C. atmosphere; phloem D. soil; xylem