The length of a year is equivalent to the time it takes for one OPTIONS:
- rotation of Earth
- rotation of the Sun
- revolution of Earth around the Sun
- revolution of the Sun around Earth
A: revolution of Earth around the Sun

The relationship between an owl and a mouse is a OPTIONS:
- parasite-host relationship.
- symbiotic relationship.
- mutualistic relationship.
- predator-prey relationship.
A: predator-prey relationship.

What characteristic helps a rabbit survive in a winter environment? OPTIONS:
- size
- strength
- long ears
- camouflage
A: camouflage

Endothermic reactions are reactions that require more energy to start than they give off in the products. Which statement describes an endothermic reaction? OPTIONS:
- It gives off heat energy and is hot to the touch.
- It absorbs heat energy and is cold to the touch.
- It gives off light energy and produces visible light.
- It gives off water and is wet to the touch.
A:
It absorbs heat energy and is cold to the touch.