Macy always thought there were only a few hair colors: blond, brown, and black. However, when she actually began looking around, she saw varying shades of these hair colors. What is possible reason for so many different hair colors?

Which best describes how parents affect the genotype of a child? a.the parents decide what to feed their child b.the parents choose whether to educate their child c.the parents allow their child to stay up late d. the parents pass along genes to the child

Nasa scientists must work together to make sure that everything is correct and accounted for when launching a shuttle. besides a physicist, what other type of scientist would be in making sure that the shuttle has the appropriate type and amount of fuel to reach its destination?

Which of the following is not a possible effectof increasimg carbon dioxide levels in the atmosphere ?