Melanin protects the skin from
a. desiccation.
b. abrasion.
c. ultraviolet radiation.
d. infrared damage.
e. invasion by bacteria.
C
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The differentiation of embryonic stem cells into neurons and glial cells is a consequence of which type of cell signaling?
A. juxtacrine B. paracrine C. autocrine D. endocrine E. All of these choices are correct.
Despite evidence to the contrary, many scientists during the mid-twentieth century remained convinced that ____________________ were the carrier of genetic information
Fill in the blank(s) with correct word
An effective means used early in the 19th century to clear water of the majority of bacteria was the use of
A. chlorine. B. iodine. C. alcohol. D. sand filters
The cuticle in plants helps in preventing:a
dessication. b. transpiration. c. diffusion of gases. d. translocation of food. e. translocation of minerals.