An animal is in an environment with a higher than normal temperature. It no longer has enough energy to reproduce or maintain homeostasis. What kind of environment is it in?
a. Suboptimal zone
b. Zone of intolerance
c. Zone of thermal instability
d. Zone of stress
d
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Individuals with variations that make them best suited to their environment will, on average, be more likely to
A. be larger B. survive and reproduce C. evolve D. change over time
In order for B cells to produce antibodies and cytotoxic T cells to attack infected host cells, they must first
A. be activated by interleukins, encounter an antigen, and then develop specificity toward it. B. recognize self markers, develop specificity for the markers, and then produce clones. C. encounter an antigen, develop specificity for that antigen, and then remember the antigen. D. undergo maturation, encounter their specific antigen target, and then become activated through cytokines.
In biological magnification,
a. poisons build up in food chains and webs so that the concentration is highest at the high end of the food chain. b. there is a tendency for an environment to change when organisms first invade. c. more highly evolved forms are able to build large populations under favorable conditions. d. parasites spread rapidly through congested populations. e. sediments fill in aquatic environments so that succession will occur if organisms disturb the aquatic habitat.
Paul, physically inactive and obese, suddenly dropped to the ground. His friends called 911, and the emergency medical technicians arrived. An emergency medical technician (EMT) quickly began to perform an EKG on Paul and saw many rapid, irregular waves
where individual QRS waves should have been. Based on the information in the text, what is your diagnosis, and what is your suggested treatment? What do you think a physician will recommend to Paul should he survive? What will be an ideal response?