____ are phagocytes that engulf bacteria and cellular debris.
A. Eosinophils
B. Leucocytes
C. Monocytes
D. Platelets
E. Neutrophils
Answer: E
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The development of vaccinations began when Edward Jenner noticed that ________
a. people who had earlier exposure to cowpox did not develop smallpox b. people who drank water from a particular public water pump developed cholera c. bacteria removed from a sick animal would cause the same illness if injected into a healthy animal d. rats were always present when people contracted bubonic plague
Referring to the above diagram of the brain, B
identifies which region?
a. hypothalamus b. thalamus c. cerebrum d. corpus callosum e. cerebellum
In which system are all three types of muscles involved in homeostasis?
a. respiratory b. digestive c. urinary d. reproductive e. cardiovascular
According to geological evidence, oxygen levels in the atmosphere began to increase about 2 billion years ago. This favored the evolution of multicellular, terrestrial organisms because:
A. More oxygen was available for cell respiration B. More oxygen was available for photosynthesis C. Some of the oxygen was used to help establish the ozone layer, and protect against harmful UV radiation D. All multicellular organisms require oxygen to survive E. More than one above is correct