Communities of organisms are made up of:
a. populations of different species.
b. different habitats.
c. two or more populations of the same species.
d. ecosystems.
e. interacting niches.
A
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What is the only known eusocial mammal?
A. humans B. naked mole rats C. beavers D. prairie dogs E. honeybees
Table salt dissolves easily in water because:a
water can form covalent linkages with salt molecules. b. water can remove electrons from the chloride ion, which causes the latter to dissociate from the sodium and dissolve. c. water can add electrons to the sodium ion. d. water is polar and salt is nonpolar. Nonpolar compounds are more soluble in polar solvents because they are able to form strong covalent bonds that result in a breaking up of the molecule being dissolved. e. the partial positive charge of the hydrogens in the water molecule can associate with the negative charge of the chloride ion, and the partial negative charge of the oxygen of the water molecule can associate with the positive charge of the sodium atom.
A cell mass that does NOT fragment and spread beyond its original area of growth is known as a(n)
A. benign tumor. B. atumoron. C. malignant tumor. D. nodule.
In vertebrates, the analogous structure to the notochord is
A) a nerve cord. B) jaws. C) a backbone. D) fins. E) a skull.