Problem:OPTIONS:
- fire
- horses
- hair
- play
- fur
- warm
- tools
- rest

Fact 1: Staying warm has a positive impact on an animal 's survival. Fact 2: Animals who live in the forest have very soft, warm fur. Given the two facts above, what has a positive impact on a forest animal's survival?
****
A: fur

Problem:OPTIONS:
- depth
- volume
- dimension
- size
- adding heat
- distance
- speed
- feet

Fact 1: Aruler is used for measuring the length of an object. Fact 2: Lengths A length is a measure of distance. Given the two facts above, a ruler is used for measuring?
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A: distance

Problem:OPTIONS:
- small
- PDAs
- massive
- dense
- white
- huge
- CO 2
- large

Fact 1: Cells vary in size as well as shape, but all cells are very small. Fact 2: Lymphocytes in circulation are small cells. Given the two facts above, what size are lymphocytes?
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A: small

Problem:OPTIONS:
- mutations
- science
- parents
- environment
- light energy
- news
- alleles
- animals

Fact 1: Evolution is a change in the characteristics of living things over time. Fact 2: Evolution relies on random chance acts to cause mutations. Given the two facts above, what causes changes in characteristics of living things over time?
****
A:
mutations