In which of the following animals do blood vessels carry a mixture of oxygenated and
deoxygenated blood?
a. swordfish
b. blue-spotted salamander
c. hawk
d. kangaroo
B
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Which of the following is an assumption used in the molecular clock approach?
A) Nucleotide changes accumulate in a sequence in proportion to time. B) Nucleotide changes are generally NOT transferred to progeny. C) Nucleotide changes are NOT random. D) Nucleotide changes are subject to intense selective pressure.
When prey populations are controlled by predators in a trophic level above them, they are said to be under ________ control
Fill in the blank(s) with correct word
cDNA sequences are expressed sequence tags (EST) that identify protein coding genes. Indicate whether the statement is true or false
The area where the optic nerve leaves the retina and where photoreceptors are absent is called the ________
A) optic area B) blind spot C) fovea D) cornea