External respiration is the process of
A) transporting gases in the blood stream to target cells.
B) exchanging air in lungs with the surrounding environment.
C) moving gases into or out of the blood stream within lung tissue.
D) gas uptake by target cells.
E) carbon dioxide release by cells into the bloodstream.
C
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Hereditary retinoblastoma is the result of a(n) ________ in the RB gene of chromosome 13 in both homologues.
A) insertion B) duplication C) inversion D) point mutation E) deletion
The oldest definitive trace of flowering plants in the fossil record consists of:
a. petals and sepals. b. primitive embryo sacs. c. pollen grains in an anther. d. pistils on vegetative stems. e. ovules enclosed in podlike fruits.
In species where the young are precocial, meaning requiring little parental care, males may be more likely to be what?
A. altricial B. monogamous C. polygynous D. polyandrous
Which of the following vessels carry blood from your brain to your heart?
a) hepatic vein b) carotid artery c) jugular vein d) coronary vein e) renal vein