A cnidarian, which is radially symmetrical, has ________ germ layer(s)
A) no B) one C) two D) three E) four
C
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The symbiotic relationship between green algae or cyanobacteria and fungi produce _________________.
Fill in the blank(s) with the appropriate word(s).
In which of the following habitat types would species diversity be expected to be relatively low?
a. high environmental stress b. low environmental stress c. continental ecosystems d. ecotones e. mature successional communities
Colchicine is a drug that:a
arrests cells in mitotic telophase. b. stimulates meiosis. c. prevents DNA replication. d. arrests cells in mitotic metaphase. e. prevents cells from entering prophase.
Mendeleev found that when he arranged the known elements according to their atomic mass, the entries in the table exhibited a pattern of chemical properties that repeated itself in groups of eight elements. This led to the generalization now known as:
A. an atomic model. B. the periodic table. C. valance electrons. D. the octet rule.