What characteristic is common to all living things?
A. All living things eat.
B. All living things are producers.
C. All living things sense and respond to change.
D. All living things have a nucleus.
E. All living things are consumers.
Answer: C
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Which of the following would help a virus avoid triggering an effective adaptive immune response?
I) having frequent mutations in genes for surface proteins II) building the viral shell from host proteins III) producing proteins very similar to those of other viruses IV) infecting and killing helper T cells A) only I and III B) only I, II, and IV C) only II and IV D) only I, II, and III E) only II, III, and IV
Parapatric speciation occurs most often ____
a. within in the same home range b. populations inhabiting different areas while maintaining contact along a common border c. within a group of interbreeding populations d. on either side of geographic barriers e. by polyploidy
The smallest branches of the respiratory tree are the:a
pharynx. b. tracheae. c. bronchial tubes. d. bronchioles. e. bronchi.
Refer to Figure 50-2. If a cut was made between numbers 6 and 10:
a. seminal fluid would not be produced. b. sperm cells would not be produced. c. sperm maturation would be inhibited. d. the seminal vesicles and the testes would be below the cut. e. None of these.