Lampreys and hagfishes:
a. are the only extant jawless vertebrates.
b. are the only extant air-breathing fish.
c. are more closely related to ray-finned fish than they are to cartilaginous fish.
d. have lobed fins.
e. first appeared within the last 50 million years.
Ans: a. are the only extant jawless vertebrates.
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Based on the table of average intron frequency given below, predict the relative order of genome size for these four eukaryotic organisms
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What situation results when a population of spotted salamanders in an area of vernal pools remains stable for many years and was stabilized because of resource limits?
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Which of the following can be measured to estimate an organism's evolutionary fitness?
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A. cellulose B. laminin C. proteoglycan D. fibronectin E. collagen