Which would be most likely to be fossilized?
A. a small worm with all soft body parts.
B. a thick-shelled oyster that lives under water.
C. a small herb growing at the top of a mountain.
D. an elephant trapped in a tar pit.
E. a thick-shelled oyster that lives under water and an elephant trapped in a tar pit.
E. a thick-shelled oyster that lives under water and an elephant trapped in a tar pit.
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Which component of a negative feedback mechanism is responsible for producing the effect that
counteracts the original environmental change away from homeostasis?
a. sensor b. response c. effector d. stimulus e. integrator
There are an estimated __________ deaths per year
in the United States from lung cancer among nonsmokers who associate with smokers. a. 1,000 b. 1,500 c. 2,000 d. 2,500 e. 3,000
Explain why X-ray diffraction was important in the study of DNA structure and describe the procedure used in X-ray
diffraction. What will be an ideal response?
A pyramid of numbers gives a reasonably accurate representation of the relationship between trophic levels when
A. all the organisms are consumers. B. all the organisms are about the same size. C. all the organisms are the same age. D. all the animals are carnivores.