Atoms of a single element that possess different numbers of neutrons are called:
A. isomers.
B. polymers.
C. ions.
D. isotopes.
E. monomers.
D. isotopes.
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The principal advantage of air sacs in birds is that:
A. They increase the surface area through which oxygen is absorbed. B. They provide better aerodynamic lift. C. They minimize the absorption of harmful gases. D. They promote continuous flow of air through the lungs thereby enhancing metabolism by making oxygen more readily available. E. All of the choices provided are correct.
An ion is:
a. a type of gas. b. an individually charged particle. c. heavy water. d. water with an extra hydrogen atom. e. a neutrally-charged atom.
Refer to the figure below for the following question(s)
©2014 Brooks/Cole, Cengage Learning Using the information in the following table, fill in the cladogram with the appropriate groups (A-J) and the distinguishing characteristics (K-S). ©2014 Brooks/Cole, Cengage Learning A. B. C. D. E. F. G. H.
I. J. K. L. M. N. O. P. Q. R. S.
What will be an ideal response?How would you best explain the existence of a mountain range that has abundant conifer trees, ferns, and mosses on the east side, but only sparse shrubby plants on the west side?
A. Differences in solar intensity produce the differing plant communities. B. Adiabatic cooling leads to temperature gradients that produce the differing plant communities. C. Differences in the specific heat of the two sides of the mountain produce the differing plant communities. D. Precipitation differences due to a rain shadow on the west side produce the differing plant communities.