These are some of the symptoms seen in persons with the eating disorder known as _____: thin, dry, brittle hair; degradation of fingernails; constipation; amenorrhea (lack of menstrual periods); decreased heart rate; loss of body proteins; weaker heartbeat.
A. obesity
B. anorexia nervosa
C. bulimia
D. All of these answers are true.
B. anorexia nervosa
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What is the function of the yolk sac in human development?
1.It is a lining of the placenta. 2.It is the source of the urinary bladder for the placenta. 3.It becomes the site of red blood cell formation. 4.It encloses and protects the embryo in a fluid-filled cavity.
What needs to happen for menstruation to begin?
a. Estrogen levels must rise. b. FSH and LH levels must rise. c. Progesterone levels must rise. d. Progesterone levels must fall.
Which cofactor is involved in the Calvin cycle reactions?
What will be an ideal response?
Check all of the following that are required for stomate opening:
A. channels B. proton pump C. facilitated diffusion D. active transport E. ATP hydrolysis