Protein hormones include
a. estrogens.
b. growth hormone.
c. melatonin.
d. thyroid hormone.
e. oxytocin.
B
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Recent fossil discoveries may represent the earliest animal species ever found. How old are they?
a. 430 million years old b. 25 million years old c. 650 million years old d. 5 billion years old
Prostate cancer kills about how many older men each year in the United States?
1.5,000 2.10,000 3.50,000 4.40,000 5.100,000
What does the pharynx open into?
A) the esophagus B) the epiglottis C) the trachea D) the larynx
Which of the following is NOT accurate about the shoot apical meristem?
A. It is found in the central region of the seedling. B. Its central zone maintains actively dividing cells. C. It gives rise to stems, leaves, and flowers. D. It has an organizing center that preserves the correct number of stem cells. E. Its peripheral zone contains dividing and differentiating cells.