The average human ejaculation contains
a. 120,000 to 400,000 sperm.
b. 1,200,000 to 4,000,000 sperm.
c. 12 million to 40 million sperm.
d. 120 million to 400 million sperm.
e. 1.2 billion to 4 billion sperm.
D
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In "type 1 diabetes,"
a. blood glucose levels are too low. b. the body receptors are insensitive to insulin. c. insulin is no longer produced by the pancreas. d. diet modification will control the disease. e. mostly middle-aged persons are affected.
Which of the following is NOT one of the key adaptations to land shared by all land plants?
A) A means of taking up nutrients from the soil B) Waxy cuticle C) Stomata D) Water transport by xylem E) Protected embryos
During early development, all cells in the embryo of a multicellular organism are identical. Later on in development, the cells will become specialized through a process called
A) apoptosis. B) cytokinesis. C) differentiation. D) interphase.
Atmospheric nitrite, produced from the reaction of ________ and ________, combines with water to form acid rain containing nitric acid (HNO3)
a. NO / O2 b. NO / O3 c. NO2 / NO3 d. N2 / O2