Ultraviolet light from the sun can a. damage nerve cells but not skin cells. b. damage molecules in skin cells, such as dna. c. cause skin cells to release stinging chemicals. d. skin cells to repair dna faster.

B.  It can damage molecules in skin cells such as DNA. Prolonged exposure can actually cause skin cancer.

in theory, limestone is composed principally of the compound calcium carbonate - caco3, but in reality this compound is deposited in conditions involving a number of other compounds as impurities so it ends up being a mixture of many compounds.

hope this : -)

tony (lordcaos066)