Male Jarrow’s spiny lizards ordinarily exhibit strong territoriality only during the ____ mating season, when elevated
blood levels of ____ stimulate their aggressive behavior.
a. summer; estrogen
b. summer; testosterone
c. autumn; octopamine
d. autumn; estrogen
e. autumn; testosterone
ANSWER: e
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You decide to plant hibiscus flowers and surround them with mulch. For a couple of months the hibiscus grow well and when you weed the garden, you see hummingbirds in your backyard eating the nectar in the hibiscus flowers
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The gut cavity may be a fully lined coelom or a partially lined __________. Fill in the blank(s) with the appropriate word(s)
Which of the following statements is true of spontaneous reactions?
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The most abundant cell type in blood is the
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