phototaxis

"She moved toward the door."

"The single-celled organism was studied by the biology students in their science class. "

"The dry-stone wall used a large, flat through to support the top stones. "

"To separate out the chaff, early cultures tossed baskets of grain into the air and let the wind blow away the lighter chaff."

"The accused refused to reveal the source of the illegal drugs she was selling."

"I saw a movement in that grass on the hill."

"Sweat was streaming down his face after the intense workout. "

"He wanted to exhibit his baseball cards."

"The positive of finishing the project early is a bonus week of vacation. "

"My parents didn't want me to go to the party, and neither did my friends. "

"Sunlight on the skin gives you vitamin D."

"As you can see, this spacious dining-room gets a lot of light in the mornings."