A ___________is made of epithelial tissue and is used to secrete substances into ducts and into the bloodstream.
A. fibroblast
B. gland
C. adipocyte
D. muscle cell
E. neuroglia
B. gland
Biology & Microbiology
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Because golden rice was developed to deal with problems of ____________________ deficiency, it is considered a(n) ____________________
Fill in the blank(s) with correct word
Biology & Microbiology
The respiratory surface of an earthworm is
found in the
a. lungs. b. gills. c. skin. d. gastrovascular cavities. e. trachaea
Biology & Microbiology
A population's demographics include its
a. size. b. age. c. structure. d. density. e. all of these.
Biology & Microbiology
Unstable isotopes can be useful
A) catalysts. B) in medical diagnosis. C) in vitamins. D) in the formation of hydrogen bonds. E) as buffers.
Biology & Microbiology