At the lake the boy holds his breath while swimming under water. after a few seconds, his lungs start to burn and he has the urge surface and gasp for air. which statement below best explains why this happens? select one: a. his body has too much oxygen and needs to get rid of it. b. his body is thirsty and needs moisture from the air. c. his body produces carbon dioxide and needs to exchange it for oxygen d. his body is hot and needs to pant to cool down.

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?

Molecular models of two different substances are shown below. in the molecule on the left, the oxygen atom pulls on electrons more strongly than the hydrogen atoms. in the molecule on the right, the two oxygen atoms pull on the shared electrons with the same strength. water molecule, h,o oxygen molecule, oz when the two substances are put in the same container, they do not attract each other. why does this happen? a. they both contain oxygen. b. one is polar and one is nonpolar. c . they are both polar. d. they contain different elements.

Ais a group of individuals of the same that exist together in the same place at the same time