A population of one flowering species consists of individuals with either pink flowers or white flowers in a field.   A daycare program takes a group of children to the field and lets them run around for an afternoon.  Before the group of children arrived, there were equal numbers of pink flowers and white flowers.  After the children leave, the flowers that are not randomly trampled and remain intact are almost all pink ones, with only a few white flowers remaining.  What mechanism of evolution has occurred?

What is the proper label for number 5 on this diagram of the heart?

Because of renal immaturity in infants, it is important to teach parents not to give their infant plain water until age:

Which of the following is true of human male reproduction?

Anxiety, disorientation, confusion, and possible depression felt when one is placed in a new and unfamiliar culture is termed:

What traits make invasive species like periwinkle vine able to so easily invade?

In the food chain oat grass -> mule deer -> human -> mountain lion, the human is a(n) ______.

Gross Motor development is: 

Match each organization with its most characteristic role in global economics.

Which element is most important to scientists doing radiometric dating?