Which of the following pHs is the most acidic?
a. 1
b. 3
c. 5
d. 7
e. 9
A
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Which of the following soil horizons is topsoil?
a. the C horizon b. the B horizon c. the A horizon d. the O horizon
Which of the following occurs after a calcium-rich meal?
A) Parathyroid hormone stimulates the activities of osteoblasts and removes calcium from the blood. B) Calcitonin removes calcium from the blood and stimulates the activities of osteoclasts. C) Parathyroid hormone is released by the thyroid gland to inhibit the activities of osteoclasts. D) Calcitonin stimulates the activities of osteoblasts and removes calcium from the blood.
A person with this lung disease experiences a loss of elastic tissue, which makes it hard to exhale
A) pneumonia B) tuberculosis C) emphysema D) influenza
The polysaccharide found in the cell walls of plants is ________.
Fill in the blank(s) with the appropriate word(s).