When cold weather freezes water in the cracks of rocks, which would most likely happen? OPTIONS:
- The rocks would become rounded.
- The rocks would be used for shelter.
- The rocks would be moved by the wind.
- The rocks would break into smaller pieces.
A: The rocks would break into smaller pieces.

In animal skin tissue, cell division is responsible for OPTIONS:
- growth and repair
- sexual reproduction
- obtaining energy
- production of sex cells
A: growth and repair

When large areas of the rainforests are cleared and burned, climate can be affected. Which best explains how rainforest destruction can contribute to the greenhouse effect? OPTIONS:
- by threatening native plants and animals
- by increasing the rate of soil erosion
- by increasing the water levels in oceans
- by releasing carbon into the atmosphere
A: by releasing carbon into the atmosphere

Eye color in human beings is an OPTIONS:
- instinct.
- acquired trait.
- inherited trait.
- environmentally influenced trait.
A:
inherited trait.