A layer of calcified tissue called ________ surrounds the pulp cavity of a tooth.
A. pulp
B. enamel
C. dentin
D. cementum
E. the crown
Answer: C
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Which one of the following is most correct concerning plant behavior?
A. It is influenced by external factors such as electrical impulses. B. It is influenced by internal factors such as plant growth regulators. C. It is influenced by internal factors such as gravity. D. It is influenced by external factors such as microRNAs. E. None of these choices is correct.
What features characterize the dialyzer used in hemodialysis? Check all that apply.
_____ Diffusion is minimized. _____ Surface area is substantial. _____ Countercurrent exchange is utilized. _____ The function is similar to the capillaries of the body.
During meiosis in a reciprocal translocation heterozygote, what are the three ways that chromosomes may segregate at anaphase I, and what are the consequences for the resulting gametes?
What will be an ideal response?
What fraction of all of the organic carbon on Earth results from microbial fixation of carbon dioxide in the oceans?
A. About 1/4 B. About 1/2 C. About 3/4 D. About 1/8