Species richness refers specifically to
a. the numbers of individuals of each species
present.
b. the ability of larger animals to enrich
themselves by successfully preying on
smaller ones.
c. the number of different species in the
habitat.
d. the feeding levels at which the animals are
located.
e. none of these.
C
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Most monocots have numerous ____ roots arising from the stem
a. adventitious b. primary c. secondary d. taproot e. nonfibrous
Potassium ion channels open ____, resulting in ____
a. as the action potential passes down the axon; a more negatively charged axon cytoplasm b. when the threshold potential is reached; the opening of more sodium channels c. during the resting potential; the diffusion of sodium ions into the axon cytoplasm d. when the action potential reaches the axon terminal; a more positively charged axon cytoplasm e. when neurotransmitters attach to dendrite receptors; no difference in the charge of the axon cytoplasm
To synthesize DNA in a laboratory, the enzyme called DNA ________ must be used to facilitate the addition of nucleotides on the new strand
Fill in the blank(s) with correct word
All of the following are functions of the extraembryonic membranes except:a
protecting the embryo. b. making food available to the embryo. c. eliminating wastes from the embryo. d. keeping the embryo dry and warm. e. obtaining oxygen for the embryo