The layer of the eye where photoreceptors are located is the
a. lens.
b. cornea.
c. pupil.
d. iris.
e. retina.
E
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The one-way flow of air along parabronchi makes what type of gas exchange mechanism possible, at least theoretically?
A) the same as that occurring in fish gills B) the same as that occurring in insect tracheae C) the same as that occurring in mammalian lungs D) the same as that occurring in echinoderm skin gills
Phenotypic sex is determined at the moment of fertilization
a. True b. False
Which of these are likely to be pioneer organisms?
A. lichens, moss, grass, and insects B. elephants and deer C. rabbits, grass, trees, and birds D. mice and men
Ovarian cancer has a poor prognosis primarily because..
A) the ovaries are inaccessible. B) nonspecific or no signs appear until after secondary tumors develop. C) the same tumor markers are present with many types of cancer. D) no effective treatment is available.