Which of the following are photosynthetic bacteria?
A. The cyanobacteria
B. The green bacteria
C. The purple bacteria
D. All of the choices are correct.
Answer: D
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The advantages of the amniotic egg include (select all that apply)
A. relatively long development times supported by a large yolk. B. the ability to resist desiccation in dry terrestrial habitats. C. improved protection from predators. D. improved ability to withstand wide temperature fluctuations. E. the ability to withstand freezing.
Nitrogen, with an atomic number of 7, has
____ electrons in the first energy level and ____ electrons in the second energy level. a. 1; 6 b. 2; 5 c. 3; 4 d. 4; 3 e. 5; 2
The spermatids are the cells in Figure 50-1 that are labeled:a
1.
b. 2.
c. 3.
d. 5.
e. 6.
Birds are living representatives of which lineage?
a. lepidosaurs b. anapsids c. archosaurs d. synapsids