A myelinated nerve fiber is ________, whereas an unmyelinated nerve fiber is ________.
Fill in the blank(s) with the appropriate word(s).
white, and composing the white matter of the brain and spinal cord; gray, and composing the gray matter of the brain and spinal cord
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The process of concentrating populations in cities is called ________
Fill in the blank(s) with the appropriate word(s).
Oceans heat and cool more slowly than land because of
A. oceans' high specific heat dampen temperature changes. B. great amounts of latent heat available to directly warm ocean water. C. oceans' lack of transparency dampen temperature changes. D. lack of mixing through the water column.
click on the examples that might be evidence of sexual selection
a. female seal choosing male with the largest territory b. dandelion dispersing seeds c. bird displaying feathers to females d. hatchling turtles scrambling to sea e. camouflaged insect f. two male deer battling with their antlers
Which of the following statements about porosity is NOT valid?
A. Fractures may be the only real porosity in some igneous rocks. B. The amount of water that can be stored depends on the porosity. C. Better sorted sediments have more porosity than unsorted ones. D. Porosity partly depends on size and shape of grains and clasts. E. All of these are valid.