Which of the following ancestors of whales could probably not have come out of the water?
a. Dorudon atrox
b. all of the choices
c. Elomeryx
d. Rodhocetus
a
Biology & Microbiology
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Which of the following are most important at all levels of metabolism?
a. enzymes b. carbohydrates c. minerals d. hydrogen ions
Biology & Microbiology
The simple tissue composed of dead, thick-walled cells that provide structural support to plants is referred to as ____
a. vascular b. dermal c. collenchyma d. sclerenchyma e. parenchyma
Biology & Microbiology
Heterozygotes with the genotype HbA/HbS have
a. sickle cell anemia. b. malaria. c. blood type AS. d. Fanconi's anemia. e. sickle cell trait.
Biology & Microbiology
The exchange of oxygen and carbon dioxide between the blood and the lungs is called ________
A) internal respiration B) inspiration C) external respiration D) exhalation
Biology & Microbiology