What kind of ecosystem are exotic species especially threatening to?
a) deserts
b) marine ecosystems
c) islands
d) tropical forests
Ans: c) islands
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Neurons tend to differ in their (select all correct choices):
A. function. B. size and shape. C. number of extensions.
Bilateria are characterized by
A. a plane of symmetry that forms mirror images around a vertical plane in the midline. B. a plane of symmetry that forms mirror images around a horizontal plane in the midline. C. a plane of symmetry around a transverse plane across the center of the body so that the front and back halves are mirror images. D. a plane of symmetry that forms mirror images around an oblique plane in the midline. E. a plane of symmetry that forms mirror images around any plane through the longitudinal midline of the body.
Research on speciation of Hawaiian crickets, shown in the accompanying figure, has led researchers to conclude that ________
A) these cricket species have diverged by a mechanism known as assortative mating B) females of different species have strong preferences for the singing pulse rate of the males of their own species C) female preference for male singing pulse rate is genetically linked to the combination of genes regulating the singing pulse rate of males D) All of the above are accurate.
Describe how alleles work in humans?
What will be an ideal response?