The theory illustrated by the accompanying figure is used to explain the origin of which organisms?
a. anaerobes
b. eukaryotes
c. prokaryotes
d. protobionts
e. vascular plants
b
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How does "the pill" work to prevent pregnancy?
A) It is a barrier between the vagina and the cervix. B) It delivers progesterone leading the ovary to discontinue ovulating a new oocyte. C) It produces an acidic environment for sperm. D) It blocks the oviduct, preventing passage of eggs or sperm.
__________ are tetrapods that live on land but
typically return to water to reproduce. Fill in the blank(s) with the appropriate word(s).
What was the dominant life form of the Mesozoic era?
a. fish b. reptiles c. mammals d. amphibians e. vascular plants
If the quantities of the four bases in a DNA molecule are measured, we find that
A) T = A and C = G. B) A = G and C = T. C) A = C and G = T. D) no two bases are equal in amount. E) all bases are equal in amount.