The tube feet of a sea star
a. bear tiny toes.
b. are located only at the tips of the arms.
c. function in movement.
d. protect the organism from predatory fish.
d
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How many oxygen molecules (O2) are required each time a molecule of glucose (C6H12O6) is completely oxidized to carbon dioxide and water via aerobic respiration?
A) 1 B) 3 C) 6 D) 12 E) 30
Researchers suggest that despite the trend observed, the depletion of oxygen from the atmosphere due to burning of fossil fuels is currently not a serious environmental concern
because the change in oxygen levels is small compared to the abundance of atmospheric oxygen, which is sufficient for survival of animals and humans. True or false. Severe declines in ocean plants (phytoplankton) due to ocean warming and acidification from dissolved CO2 (forming HCO3 - and CO3 2-) could potentially lead to larger decreases in O2 levels over time, thereby altering this conclusion. What will be an ideal response?
Which of the following sub-disciplines of
biology focuses on understanding the entire genetic composition of organisms?
a. evolutionary biology b. molecular biology c. genomics d. comparative anatomy e. embryology
Slash-and-burn agriculture affects global warming by ___
a. adding more methane gas to the environment, thereby increasing greenhouse gases b. removing methan producers from the environment, thereby decreasing greenhouse gases c. removing photosynthetic organisms from the environment, thereby increasing CO2 in the environment d. removing photosynthetic organisms from the environment, thereby decreasing CO2 in the environment e. no effect will be seen in global warming or greenhouse gases from this type of agriculture