Fatter sociable weaver birds spend more time foraging where they are vulnerable to predation, are more attractive to

predators, and are less likely to escape an attack. Conversely, thin birds risk starvation. Therefore, sociable weaver of an
intermediate weight have a selective advantage. This is an example of ____ selection.



a. frequent

b. directional
c. disruptive
d. stabilizing
e. mutational


ANSWER: d

Biology & Microbiology

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Indicate whether the statement is true or false

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There was a massive immigration of Irish to the United States in the mid-19th century because of a failure of the Irish potato crop caused by:

A. Trichomonas vaginalis B. Plasmodiuim falciparum C. Phytophora infestans D. Giardia lamblia E. Spudsik emeraldensis

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Skeletal muscles make up approximately

____% of the body weight of a young man of average fitness.

a. 15 b. 20 c. 25 d. 30 e. 40

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Which of the below causes the word threat of lead in most places in the world

a. paint b. gas c. metal processing d. waste disposal

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