Fact 1: Monotremes are mammals that reproduce by laying eggs. Fact 2: Echidnas are monotremes, or egg laying mammals. Given the two facts above, how does an echidna reproduce?

OPTIONS:
- during the day
- it can be seen
- gastropod shells
- Laying eggs
- litter
- aerobic capacity
- mechanical
- electrically

Answer: Laying eggs

Fact 1: Male dogs use pheromones in urine to mark their territory. Fact 2: Generally, pheromones are volatile substances. Given the two facts above, male dogs use what in their urine to mark their territory?

OPTIONS:
- hydrocarbons
- volatile substances
- kinetic energy
- an area swollen with pus
- Chemical energy
- competing for resources
- add a solute
- Positive charges

Answer: volatile substances

Fact 1: Producers use energy and inorganic molecules to make food. Fact 2: Leaves make food for the plant. Given the two facts above, some producers use what physical feature to use energy and inorganic molecules?

OPTIONS:
- leaves
- sunlight
- solar energy
- sun
- resevoir
- chemicals
- mitosis
- trees

Answer: leaves

Fact 1: When metal conducts heat , that metal expands. Fact 2: Steel is a solution of metals. Given the two facts above, when does steel expand?

OPTIONS:
- matter vibrating
- when it loses heat
- It gets heated up
- flow of electrons
- when it transfers heat away
- recovery time from fatigue
- when it conducts heat
- when it cools down

Answer:
when it conducts heat