The bodies of arthropods are supported mainly by ____
a. an exoskeleton
b. only nonskeletal structures
c. a hydrostatic skeleton
d. an endoskeleton
e. joined exo- and endoskeletons
ANSWER: a
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A _______ allele encodes a protein that is made in the proper amount and functions normally
A. loss-of-function B. mutant C. wild-type D. gain-of-function E. lethal
Which statement is true regarding bacteria?
A. Some bacteria are pathogens and harmful to humans, whereas lots of bacteria are helpful to humans. B. All bacteria are pathogens, but some harm humans more than others. C. All bacteria are helpful to humans. D. All bacteria are pathogens and harmful to humans.
Which of the following is categorized as a terrestrial ecosystem?
a. Amazon rainforest b. Lake Michigan c. Indian Ocean d. Rio Grande
Why did internal fertilization likely evolve?
A. As an adaptation to life in a terrestrial environment. B. To increase the chances of successful fertilization. C. Because there were no safe places to lay eggs. D. As a response to copulation.