Why do many non-native species, such as a prickly pear cactus brought to Australia from South America, rapidly become abundant when first introduced?
A) Non-native species increase their reproductive rate when introduced.
B) The climate in the new site is more favorable than in its native site.
C) The carrying capacity at the new site is higher than that at the native site.
D) There are fewer predators and parasites capable of attacking the non-native species in the new site.
E) Growth changes from an S-curve to a J-curve at the new site.
D
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Over long periods of 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, but accounts only for new structures and functions. B) Natural selection accounts for these losses by the principle of use and disuse. C) Under particular circumstances that persisted for long periods, each of these structures presented greater costs than benefits. D) The ancestors of these organisms experienced harmful mutations that forced them to lose these structures.
In some organisms, crossing-over does not occur, and the homologous chromosomes are held together via some other
mechanism. Even though crossing-over leads to genetic diversity, the absence of crossing-over in these organisms does not prevent the production of diverse gametes. Why is this?
What will be an ideal response?What endogenous process helps plants to keep their movements and other responses synchronized with the environment?
A. gravitropism B. purine monitoring C. solar tracking D. a circadian clock E. auxin cycling
The Rn anticipates the child will be worked up for pinworm infection. What is the causative organism?
A. enterobiusvermicularis B. taenia solium C. trichinella spiralis D. ascaris lubricoides