Sugar is conducted in solution through specialized cells known as:
a. fibers.
b. companion cells.
c. sieve tube elements.
d. tracheids.
e. vessels.
C
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Green algae such as Ulva demonstrate an alteration of generations. The diploid phase is called the
a. gametophyte generation. b. embryo. c. sporophyte generation. d. diploid generation. e. zygote.
The krebs cycle occurs in the mitochondrion
a. true b. false
The amniotes differ from the amphibians in that they
a. have efficient kidneys. b. have a waterproof skin. c. have internal fertilization. d. have a shelled amniotic egg. e. include all of these.
The accompanying figure shows that the rate of alarm calls made by black-tailed prairie dogs is dependent on a perceived threat by a predator. This behavior affects ________
A) the direct fitness of the caller B) the indirect fitness of the caller C) both the direct and indirect fitness of the caller D) neither the direct nor indirect fitness of the caller