Animals establish and defend territories only when ____

a. the effort does not endanger the life of the individual
b. males compete for females by fighting
c. some critical resource is in short supply
d. females choose among displaying males
e. territorial defense is not energetically costly


ANSWER: c

Biology & Microbiology

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first?

a. embryonic shoot b. embryonic root c. coleoptile d. cotyledons e. the embryonic root and shoot emerge at the same time

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Which of the following is altered in a program to increase flexibility?

What will be an ideal response?

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Atmospheric CO2 levels have increased approximately ________ since the beginning of the Industrial Revolution

a. 5% b. 10% c. 20% d. 40%

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