Worker bees are rendered sterile because of ________
Fill in the blank(s) with correct word
queen substance (or queen pheromones)
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Hemagglutination is
A. the clumping together of red blood cells in the presence of a viral suspension. B. the clumping together of infected cells in the presence of a viral suspension. C. the binding of iron in the process of a viral suspension. D. None of the choices are correct.
Alex has just given blood at the Red Cross blood drive, and immediately after the event, his
blood pressure is a little lower than normal. How might his body respond to this?
a. Arteries can constrict to increase blood pressure. b. His body is able to immediately manufacture new blood cells. c. All the lost blood cells are replaced with water. d. Veins can dilate to reduce blood flow.
The function of the structure labeled 1 in Figure 35-2 is:
a. the formation of pith. b. protection. c. conduction of water and dissolved minerals from the roots. d. conduction of sugars from the leaves. e. photosynthesis.
The main features that place Homo habilis in the genus Homo rather than Australopithecus are
A. hand grip, extensive use of tools, and house-building. B. care of young and altruistic behavior. C. human facial appearance and lack of hair. D. brain size, dentition, and tool use. E. advanced use of language and total carnivorous diet.