(Q).
You are presented with the question "What in an electric fan provides a cooling breeze?" and the following answer choices: - kinetic energy - metal face - heat energy - activation energy - Solar energy - plastic buttons - vanes rotating - electric cord Now knowing that the vanes rotating in an electric fan causes air to move and fans move air, providing a cooling breeze, choose the best answer.
(A).
vanes rotating

(Q).
You are presented with the question "Cells have multiple repair mechanisms to fix the effects of what?" and the following answer choices: - A drug. - acid rain - death - herbicide - radiation - cancer - chemicals - disease Now knowing that cells have multiple repair mechanisms to fix mutations in DNA and dNA damage is a cause of mutations that can cause cancers, choose the best answer.
(A).
cancer

(Q).
You are presented with the question "what helps make up the excretory system?" and the following answer choices: - sugar - gills - h2o - lungs - aorta - bowel - fungi - honey Now knowing that organs of excretion make up the excretory system and excess estrogen is excreted in the bowel, choose the best answer.
(A).
bowel