What are some challenges land plants face compared to life in the water?
A. Obtaining resources from the air and soil instead of from water
B. Obtaining and retaining moisture
C. Staying upright against the pull of gravity
D. All of the above are challenges faced by land plants.
Answer: D
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Which is the predominant second messenger involved in regulating glucose metabolism?
a. insulin b. glucagon c. adenyl cyclase d. cyclic AMP e. G protein
A ____________________ organism is one that carries a gene that has been transferred to it from
another species. Fill in the blank(s) with the appropriate word(s).
The emergence of many diverse species from a common ancestor that finds itself in a new environment is called
A) adaptive radiation. B) gradualism. C) disruptive selection. D) allopatric speciation. E) hybridization.
The NPK percentages on a package of fertilizer refer to the _____
A) percentages of manure collected from different types of animals B) relative percentages of organic and inorganic nutrients in the fertilizer C) percentages of three important mineral nutrients D) proportions of three different nitrogen sources