Cells of the blastula undergo ____, a process that forms and segregates the three germ layers
a. morphogenesis
b. development
c. gastrulation
d. cleavage
e. division
c
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The evolution of organisms that use oxygen in their respiration was possible only because of the action of a group of bacteria that produced oxygen and changed the Earth's atmosphere from an anoxic one to one rich in oxygen. That group of bacteria was:
A. Cyanobacteria B. spirochaetes C. Proteobacteria D. Staphylococcus E. Actinobacteria
By the end of the Devonian period, which of the following plants populated the landscape?
a. flowering plants and trees b. mosses and other bryophytes c. ferns, horsetails, and seed plants d. algae and early vascular plants
A bloom is a rapid increase in
A. algae. B. temperature. C. light. D. fish.
The pH of a fluid is a measure of:
a. how acidic or basic it is. b. the concentration of phosphate groups. c. the amount of adenosine triphosphate (ATP) in it. d. its capacity to function as a soap. e. its enzymatic stability.