A good average value for the amount of energy that reaches the next trophic level is about
A. 20%.
B. 10%.
C. 1%.
D. 2%.
E. 5%.
Answer: B
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A candy bar contains 108 calories per serving. There are 4 grams of carbohydrate, 5 grams of protein, and 8 grams of fat in a serving. How many of the calories come from fat?
A. 72 B. 16 C. 18 D. 20
Trichoplax
a. is a small, flattened, soft-bodied marine animal. b. is placed with sponges on the animal family tree. c. has the smallest genome of all the animals. d. has no mouth but rather uses extracellular digestion and absorption. e. fits all of these descriptions.
How does an intercalating agent such as ethidium bromide cause mutations?
What will be an ideal response?
The greatest mass extinction of all time occurred at the end of the ____ era, in which more than 90% of all existing
marine organisms became extinct.
a. Archaean b. Paleozoic c. Cenozoic d. Mesozoic e. Proterozoic