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

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

The respiratory surface of an earthworm is

found in the

a. lungs. b. gills. c. skin. d. gastrovascular cavities. e. trachaea

Biology & Microbiology