What are soil mineral particles that are less than 0.002 mm in diameter called?
a. sand
b. humus
c. clay
d. silt
Ans: c. clay
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Which one of the following are structures in the body that are composed of two or more different tissue types joined together to perform a specific function?
A) tissues B) organs C) organ systems D) junctions E) body cavities
Sponges and brittle stars are members of the ____ category of organisms:a
nekton b. phytoplankton c. zooplankton d. benthos e. profundal zone
Different geographical barriers physically separated the tortoises on the Galápagos Islands. This separation resulted in the evolution of subspecies. This is an example of _____ speciation.
a. prezygotic b. postzygotic c. sympatric d. outgroup e. allopatric
Which cells directly attack abnormal cells in the body?
a. Cytotoxic T cells b. Helper T cells c. Phagocytes d. B cells