question:
In Costa Rica a small tree, the acacia, provides shelter and food for ants. The ants protect the acacia by removing other insects and vines that might harm it. Which term best describes the relationship between the acacia and the ants?
OPTIONS:
- competition
- mutualism
- parasitism
- predation

answer:
mutualism

question:
A drain cleaner consists of sodium hydroxide and aluminum. When the drain cleaner is added to water, bubbles of hydrogen are produced, and the solution becomes very hot. Which of these best describes what happens to form the bubbles when the cleaner is added to water? F
OPTIONS:
- chemical reaction
- Condensation
- A physical change
- Evaporation

answer:
chemical reaction

question:
A son can inherit traits
OPTIONS:
- only from his father
- only from his mother
- from both his father and his mother
- from either his father or his mother, but not from both

answer:
from both his father and his mother

question:
Which statement best describes the energy transformations that occur when a candle burns?
OPTIONS:
- Heat energy from the wax is converted into chemical and light energy.
- Heat energy from the air is converted into mechanical and light energy.
- Chemical energy from the wax is converted into light and heat energy.
- Chemical energy from the air is converted into mechanical and light energy.

answer:
Chemical energy from the wax is converted into light and heat energy.