As elevation increases
a. O2 availability increases.
b. O2 availability decreases.
c. O2 availability remains constant.
d. O2 levels increase, but there is none present above 20,000 feet.
e. O2 levels decrease, but there is none present above 20,000 feet.
B
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The difference between benign and malignant tumors is that
A) benign tumors have not lost growth control. B) benign tumors do not stimulate angiogenesis. C) benign tumors have not spread to other sites. D) malignant tumors are adherent. E) benign tumors are cancers, while malignant tumors are not.
In all but the simplest animals, osmoregulation and excretion is carried out using tubules that are ____
a. specialized blood vessels b. part of the lining of the digestive tract c. modifications of the respiratory and digestive systems d. associated with the surface of the skin e. formed from transport epithelium
__________ are important and common unicellular exocrine glands.
Fill in the blank(s) with correct word
The trade-off between investments in current reproduction and in growth that promotes future reproduction is referred to as the total cost of what?
A. Adaptation B. Selection C. Genetic change D. Reproduction E. Fitness