Scientists have designed solar cells to trap solar energy and convert it to energy.

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

Freckles are a dominant trait in humans. both of the girls have the genotype ff for freckles. if either one marries a man with no freckles, what are the chances that their children will have freckles?

Drag each tile to the correct location. match each trait that an organism displays to a reproductive strategy.