Certain gases in the upper atmosphere allow sunlight to pass through to Earth's surface, but prevent heat from escaping. This is known as
A) global positioning.
B) desertification.
C) the greenhouse effect.
D) thermal inversion.
E) eutrophication.
C
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Primary endosymbioses gave rise to ________ and secondary endosymbioses gave rise to ________
A) chloroplasts in algae / chloroplasts in plants B) mitochondria in eukaryotes / chloroplasts in eukaryotes C) chloroplasts and mitochondria in plants and red and green algae / chloroplasts in other eukaryotes D) chloroplasts and mitochondria in green and red algae / chloroplasts and mitochondria in diatoms
The _____ has endocrine and exocrine functions
a. hypothalamus c. pineal gland b. pancreas d. parathyroid gland
Which of the following is caused by a vitamin B1 (thiamine) deficiency?
A. scurvy B. rickets C. pellagra D. beriberi E. high blood sugar
Multiple sclerosis is
A) a type IV hypersensitivity disease in which cytotoxic T cells attack the myelin sheath of neurons. B) a genetic birth defect of the nervous system. C) a type II hypersensitivity to the myelin of neurons. D) the formation of antibodies against transplanted tissue. E) a neurological disease due to the accumulation of immune complexes in nerves.