Archaeans include three main groups: methanogens (methane producers), extreme __________ (salt lovers), and extreme __________ (heat lovers).
Fill in the blank(s) with the appropriate word(s).
thermophiles; halophiles
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A vertebrate's circulatory system would not include:a
a muscular heart. b. blood vessels. c. lymph vessels. d. a hemocoel. e. blood.
The condition that is characterized by a loss of calcium from the bone is called:a
osteitis. b. osteoporosis. c. osteophoresis. d. osteoarthritis. e. osteon disease.
The body system which functions to regulate the activities of other body systems by secreting chemical messengers called hormones is the
A. endocrine system. B. cardiovascular system. C. nervous system. D. respiratory system.
Paralytic shellfish poisoning occurs when ________ are eaten by humans or marine mammals
A) euglenids B) diplomonads C) diatoms D) excavates E) dinoflagellates