Which of the following mutualistic relationships have the largest impact on population dynamics?
A) obligate mutualists
B) generalist pollinators
C) nitrogen-fixing bacteria
D) seed-dispersing animals
A
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The partial negative charge in a molecule of water occurs because _____
A) the oxygen atom donates an electron to each of the hydrogen atoms B) the electrons shared between the oxygen and hydrogen atoms spend more time around the oxygen atom nucleus than around the hydrogen atom nucleus C) the oxygen atom has two pairs of electrons in its valence shell that are not neutralized by hydrogen atoms D) the oxygen atom forms hybrid orbitals that distribute electrons unequally around the oxygen nucleus E) one of the hydrogen atoms donates an electron to the oxygen atom
The genetic preservation of the features that increase the likelihood of survival and reproduction of some individuals within a population is called the process of
A. increasing evolutionary resistance. B. creation of new species. C. genetic drift. D. outcrossing. E. natural selection.
In which of the following laws did Mendel assert that one trait in a heterozygote will conceal the presence of another trait for the same characteristic?
a. law of dominance b. law of segregation c. law of dependent assortment d. law of incomplete dominance
Which of the following phyla do not develop as protostomes?
a. flatworms b. molluscs c. annelids d. arthropods e. echinoderms