T or F: All muscles attach to the bone through a tendon
What will be an ideal response?
False
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During male sexual arousal ____
a. penile blood vessels are constricted b. blood flow out of the penis increases c. testosterone levels fall d. sensory nerve endings of the penis are inactivated e. blood flow to the penis is increased
Miller and Urey's experiment provided support for what hypothesis? In what way did the discovery of hydrothermal vents alleviate concern about the validity of their simulation of the Earth's primitive atmosphere?
What will be an ideal response?
A __________ is a virus that infects only bacteria. Fill in the blank(s) with the appropriate word(s)
Scientists may change how an organism is classified for various reasons. Which of the following would be the most likely reason for the classification of an organism to change?
A) The organism could no longer interbreed with members of its own species. B) The organism grew significantly larger. C) The organism changed its habitat from a warmer to colder climate. D) The organism produced several offspring