Which of the following is a trait shared by mammals and reptiles that is not shared by the other groups of chordates?
A. mammary glands
B. hair
C. lungs
D. an amnion
E. legs
D. an amnion
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The nitrogenous base that is only found in DNA and not in RNA is: rev: 02_22_2014_QC_45858
A. cytosine. B. uracil. C. adenine. D. thymine. E. guanine.
Mammals such as the vampire bat have the ability to generate a urine with a concentration of approximately 3,600 milliosmoles (mOsm). If the concentration of their blood is approximately 300 mOsm, by producing a concentrated urine, their water loss is
A. Reduced by approximately 11/12. B. Reduced by approximately ½. C. Actually increased by approximately ½. D. Reduced by approximately 5/6. E. Not reduced.
A measure of the reproductive fitness of an individual without the help of others is known as ________
A) direct fitness B) indirect fitness C) inclusive fitness D) kin selection
One advantage to being an ectotherm is that an ectotherm
a) can reduce its body heat by sweating b) needs less energy to maintain homeostasis c) can generate its own body heat d) can survive easily in colder climates