Fact 1: If fossils of an animal or plant are found in a place then that animal or plant used to live in that place. Fact 2: Fossils are preserved original remains or preserved evidence of plants and animals. Given the two facts above, if _ of an animal are found in a place then that animal used to live in that place?
OPTIONS:
- living things
- offspring
- predators
- prey
- it keeps an organism warm
- phylum arthropoda
- solid, liquid, gas
- preserved remains

Answer: preserved remains

Fact 1: Blood pH may become unbalanced if the rate of breathing is too fast or too slow. Fact 2: Breathing is regulated to keep as normal as possible arterial blood pH and PO2. Given the two facts above, what is regulated by breathing?
OPTIONS:
- thirst
- air pressure
- blood flow
- body water
- Energy
- Chemical energy
- Decibels
- kinetic energy

Answer: blood flow

Fact 1: All life relies on a relatively narrow range of pH, or acidity. Fact 2: All organisms have a life-span. Given the two facts above, organisms rely on a relatively narrow range of what?
OPTIONS:
- Decibels
- water
- food
- relativity
- acidity
- spectrum
- balance
- Light

Answer:
acidity