Which of the following organisms is a keystone species in a tropical rain forest?
a. gray wolf
b. fruit-eating bats
c. poison arrow frogs
d. fig trees
e. fruit-eating monkeys
D
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The observation that island D. yakuba are more closely related to mainland D. yakuba than island D. yakuba are to D. santomea is best explained by proposing that D. santomea _____
A) descended from a now-extinct, non-African fruit fly B) arrived on the island before D. yakuba C) descended from a single colony of D. yakuba, which had been introduced from elsewhere, with no subsequent colonization events D) descended from an original colony of D. yakuba, of which there are no surviving members. The current island D. yakuba represent a second colonization event from elsewhere.
Enteric bacteria such as Salmonella spp., Shigella spp., and Escherichia spp. most often contaminate and spoil
A) meat. B) fruits. C) grains. D) milk and milk products.
Elastin is found only in insects and some crustaceans and is the most elastic material known
Indicate whether the statement is true or false.
In plants, the haploid, single-celled product of mitosis is a
A) sporophyte. B) gametophyte. C) zygote. D) spore. E) gamete.