What advantage is associated with human testes located in an external sac rather than in the abdominal cavity?
A) a shorter distance that semen must travel during ejaculation
B) the testes can be kept at a constant temperature
C) the testes can be kept cooler than the body's interior
D) the testes can enlarge at sexual maturity
C
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A number of different types of microscopy exist. Each type of microscopy has advantages and disadvantages. Can you identify the microscope that would be most advantageous for the situation below?
a. A cell biologist wishes to visualize the ribosomes of a cell. b. A bacteriologist wishes to examine the motility of a bacterium. c. An immunologist wishes to determine if a lymphocyte possesses a certain surface protein. d. A virologist is trying to determine the three-dimensional shape of a virus. e. A pathologist is trying to examine the cytoplasm of a cell for changes that result from viral infection.
Which human bone is found in the pectoral
girdle?
a. clavicle b. humerus c. radius d. sternum e. tibia
The model of speciation that hinges on a physical barrier preventing gene flow is ________ speciation
Fill in the blank(s) with correct word
The total number of named species is about
A) 160. B) 1.6 billion. C) 160,000. D) 1,600. E) 1.6 million.