Tritiated hydrogen (3H) differs from hydrogen (1H) in that
A. 3H has 2 more protons than 1H.
B. 3H has 2 more electrons than 1H.
C. 3H has 2 more neutrons than 1H.
D. 3H has the same number of neutrons as 1H.
E. 3H has a different electron configuration than 1H.
C. 3H has 2 more neutrons than 1H.
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Droplet nuclei typically travel no farther from point of release than
A. 3 meters. B. 5 meters. C. 1 meter. D. They are suspended indefinitely.
Dispersal agents, such as pollen-carrying wind or seed-carrying animals, are responsible for ____ in most plant
populations because they often introduce novel alleles into a population.
a. gene flow b. genetic drift c. mutations d. nonrandom mating e. natural selection
Feeding levels in an ecosystem are also known as ____
a. nutritional levels b. nourishment levels c. trophic levels d. niche levels e. biome levels
The firefly (Photinus†granulatus) and the zebra mussel (Dreissena†polymorpha) are both members of the kingdom Animalia. This indicates that they must also both be members of the same
A. phylum B. genus C. species D. order E. domain