Cellular respiration results in the production of adenosine triphosphate (ATP) molecules for energy. The most efficient form of cellular respiration would result in the production of ATP along with which substances? OPTIONS:
- oxygen and energy
- glucose and glycogen
- lactic acid and alcohol
- carbon dioxide and water
A: carbon dioxide and water

When a baby shakes a rattle, it makes a noise. Which form of energy was changed to sound energy? OPTIONS:
- electrical
- light
- mechanical
- heat
A: mechanical

A student is asked to make soil using the following substances: water, ore, humus, crystal, weathered rock, and metamorphic rock. Which combination of these substances should the student choose? OPTIONS:
- humus, crystal, and ore
- water, weathered rock, and humus
- water, metamorphic rock, and crystal
- metamorphic rock, ore, and weathered rock
A: water, weathered rock, and humus

A company is designing a new laptop computer. The computer must not exceed a certain weight. Which of the following is the most likely reason to have a weight restriction for the computer? OPTIONS:
- to make it easier to test the prototype
- to reduce the cost of making the computer
- to make it easier to transport the computer
- to reduce the cost of building the prototype
A:
to make it easier to transport the computer