Refer to Figure 49-1. Which of the following hormones is secreted by the adrenal cortex?
a. 1
b. 2
c. 4
d. 6
e. 8
C
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Epizootic diseases often occur in wild animals on a periodic or cyclic basis
Indicate whether the statement is true or false.
Isotopes of atoms
a. are electrically unbalanced. b. behave the same chemically and physically but differ biologically from other isotopes. c. are the same physically and biologically but differ from other isotopes chemically. d. have the same number of protons but a different number of neutrons. e. are produced when atoms lose electrons
The stone tools and the dentition of Homo habilis indicate that early humans were
A. strictly carnivores. B. omnivores that could either scavenge or hunt for meat. C. strictly scavengers. D. strictly herbivores.
Which of the following groups of photosynthetic bacteria are capable of oxygenic photosynthesis?
A. The cyanobacteria B. The green bacteria C. The purple bacteria D. All of the choices are correct.