Which of the following animals has a three-chambered heart?
A) snake
B) crocodile
C) human
D) bird
Answer: A
Biology & Microbiology
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Rubbing a substance on uncoated paper should reveal if it contains
(a) lipid. (b) carbohydrate. (c) protein. (d) sugar.
Biology & Microbiology
The fovea is the area of the retina:
A. where the optic nerve attaches to the retina, and that doesn't have any rods or cones B. where all blood vessels merge with the retina C. associated with high concentrations of cone cells, and that corresponds to the center of the visual field in most vertebrates D. that contains mostly rod cells, and explains why peripheral vision is limited at night
Biology & Microbiology
In humans, blood cells are produced in the
a. bone marrow. b. heart. c. kidneys. d. liver. e. lymph nodes.
Biology & Microbiology
The bone in the thigh is the
a. femur. b. tibia. c. fibula. d. ulna. e. scapula.
Biology & Microbiology