Which statement is true of electron shells?
a. The innermost shell can hold up to two electrons.
b. The innermost shell is at the highest energy level.
c. A shell can hold up 20 electrons.
d. Larger atoms have less electron shells.
e. A second shell with six electrons is completely filled
ANSWER: a
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A flower on a plant represents which level of organization?
A. atom B. cell C. organ D. organism E. population
Over evolutionary time, many cave-dwelling organisms have lost their eyes. Tapeworms have lost their digestive systems. Whales have lost their hind limbs. How can natural selection account for these losses?
A. Natural selection cannot account for losses, only for innovations. B. Natural selection accounts for these losses by the principle of use and disuse. C. The ancestors of these organisms experienced harmful mutations that forced them to find new habitats that these species had not previously used. D. Under particular circumstances that persisted for long periods, each of these structures presented greater costs than benefits.
Some chytrids have true mycelia, but others may consist of a single cell or a small multinucleate mass.
Answer the following statement true (T) or false (F)
The set of blood vessels with the slowest velocity of blood flow is
A) the arteries. B) the arterioles. C) the metarterioles. D) the capillaries. E) the veins.