Which of the following controls the temperature in endothermic animals?
A) Reflexive skeletal muscles
B) Autonomic nervous system
C) Cerebral cortex
D) Positive feedback systems
E) Hypothalamus
E
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Answer the following statements true (T) or false (F)
1. Humans exert top-down pressures on white-tail deer. 2. Using insects from the original homeland to control invasive weeds is a form of biological control. 3. Resource partitioning enables similar species to coexist in a community. 4. Secondary metabolites can become essential feeding stimulants for some herbivores.
An example of a ?-hemolytic gram-positive organism is:
a. Staphylococcus aureus. b. S. pneumoniae. c. Escherichia coli. d. Enterococcus.
In most male animals, the penis or other copulatory organ achieves erection by
A. artery dilation or hemolymph pressure. B. bones or exoskeleton interlocking. C. muscle contraction. D. testicular pressure.
Eukaryotic cilia and flagella:
A) may also act as receptors for hormones. B) are both involved in sweeping the lungs clean of foreign matter. C) occur in large numbers on the surface of the cell. D) are only found in single-celled organisms. E) both have microtubules forming their underlying structure.