Select all of the following that are postzygotic isolating mechanisms.
_____Hybrids are sterile.
_____Hybrids develop abnormally.
_____Hybrids fail to become established in nature.
_____ Hybrids cannot be formed.
__X__ Hybrids are sterile.
__X__ Hybrids develop abnormally.
__X__ Hybrids fail to become established in nature.
_____ Hybrids cannot be formed.
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Which of the following is NOT involved in nonspecific defenses?
A. natural killer cells B. monocytes C. neutrophils D. mast cells E. B cells
During interphase, the chromosomes are loose and thread-like but they tightly condense in preparation for mitosis. Why?
What will be an ideal response?
Sam was in a terrible head-on collision. When he recovered from all of the obvious, external injuries, the once affable and happy-go-lucky person had become surly and very unfriendly. Which part of his cerebrum was most likely damaged?
A) prefrontal cortex B) Broca's area C) thalamus D) postcentral gyrus
Which of the following is a potential risk of exotic species?
a) introduction of new diseases b) native species being outcompeted c) alteration of habitats d) all of these are potential risks