When ice melts, it becomes a OPTIONS:
- gas.
- solid.
- liquid.
- plasma.
A: liquid.

Some birds fly south before winter each year. This is an example of OPTIONS:
- migration
- hibernation
- germination
- evaporation
A: migration

The stages in the life cycle of an organism are shown below. birth -> growth -> development -> reproduction -> death In which life cycle stage will a new organism be made? OPTIONS:
- growth
- development
- reproduction
- death
A: reproduction

Which of the following remains constant in Earth's carbon cycle? OPTIONS:
- the total mass of available carbon
- the way organisms use carbon
- the physical state of carbon-containing molecules
- the molecule in which a particular carbon atom is found
A:
the total mass of available carbon