Parasites of humans are found in all EXCEPT which
of the following phyla?
a. Platyhelminthes
b. Nematoda
c. Annelida
d. Echinodermata
e. Arthropoda
Answer: d
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The foramen magnum is a passageway for
a. nasal cavities. b. eye sockets. c. spinal cord. d. Haversian (central) canals. e. synovial fluid.
The highest elevation at which trees can grow is
A. the Arctic tree line. B. usually determined by salt spray. C. determined by temperature. D. the Antarctic tree line. E. usually determined by oxygen concentration in the atmosphere.
Superfund sites ______________.
A. are mildly polluted B. require no response at all C. are so polluted, they require emergency federal response D. are only found in rural areas E. are only found in urban areas
Which type of tissue protects a plant from losing water?
A. parenchyma B. meristem C. epidermis D. collenchyma