The main regulator of calcium blood levels is
a. the parathyroid glands.
b. the thyroid glands.
c. the hypothalamus.
d. the anterior pituitary gland.
e. the posterior pituitary gland
A
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The baroreceptors are located in the ____
a. adrenal glands b. brainstem c. heart d. erythrocytes e. walls of blood vessels
The tunic of tunicates is composed of:
a. a cellulose-like substance. b. chitin. c. silica. d. calcium carbonate. e. starch.
Which of the following terms does NOT belong with the other four?
a. Radiolaria b. Chlorarachniophyta c. Foraminifera d. Charophyta e. Rhizaria
After estimating a probit model for whether an individual purchases a particular product as a function of income, which of the following conditions must hold?
A. The predictions will fall between zero and 1. B. The predictions will sum to zero. C. The intercept will be positive. D. The r-squared will be one.