The diurnal or nocturnal behavior of animals is regulated - in a large part - by which of the following hormones?

A. calcitonin
B. serotonin
C. melatonin
D. oxytocin
E. epineprhine


C

Biology & Microbiology

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The greatest number of pathogens enter the body through the ________.

A. skin B. respiratory system C. gastrointestinal system D. urinary system E. genital system

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Desensitization

A. stimulates an increase in IgG. B. reduces the number of mast cells. C. increases the number of basophil cells. D. is a treatment for hypersensitivity reactions. E. stimulates an increase in IgG AND is a treatment for hypersensitivity reactions.

Biology & Microbiology

List at least 3 adaptations of rocky intertidal animals to resist desiccation

What will be an ideal response?

Biology & Microbiology

What are 2 reasons why tropical environments are potentially less vulnerable to the effects of oil pollution than higher latitude areas?

What will be an ideal response?

Biology & Microbiology