What might occur if blood calcium levels rise?
A. Blood parathyroid hormone levels would decrease.
B. Blood parathyroid hormone levels would increase.
C. Blood vitamin D (1,25 dihydroxyvitamin D) would be stimulated.
D. Blood calcium levels are not under control by hormones.
E. Vitamin D would be converted to vitamin E.
A. Blood parathyroid hormone levels would decrease.
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What soil component is most important for retaining water in soil for use by plants?
a. sand b. humus
c. clay d. silt e. rock
The tissue type that covers internal and external surfaces of organs, aids in protection, nutrition absorption, and gas diffusion is the _______ tissue.
A. connective B. nervous C. muscle D. epithelial E. All of the answer choices are correct.
A receptor potential is an all-or-none response
____________________ Indicate whether the statement is true or false.
What does the presence of similar genes in very dissimilar organisms imply?
a. the genes were produced by different selection pressures b. the organisms share a common ancestor c. the organisms do not share a common ancestor d. the genes became identical through mutation