input: OPTIONS:
- sleeping
- eating other living things
- Transfers energy
- converting mass to energy
- Something coming from a gland
- photosynthesis
- dying
- competing for resources Now, answer this question: Fact 1: Heterotrophs get food by eating other living things. Fact 2: Great egrets are heterotrophs . Given the two facts above, great egrets get food by doing what?
A:
output: eating other living things

Fact 1: Sonar is used to find the location of an object. Fact 2: Active Sonar Active sonars transmit acoustic energy and detect targets by echolocation. Given the two facts above, what is used to find objects underwater?

OPTIONS:
- echolocation
- a hydraulic system
- heat energy
- Electrical energy
- dolphins
- mussels
- by indirect light
- rays or beams

Answer: echolocation

Problem: OPTIONS:
- heat energy
- a disc
- a meal
- energy
- an engine
- voltage
- a stick
- arteries
Q: Fact 1: Producing thrust causes something to move. Fact 2: An engine is needed to provide the thrust for forward motion. Given the two facts above, causing something to move can need what?
Answer: an engine

Problem:OPTIONS:
- Social
- immune
- ligt
- grow
- live
- DNA
- sex
- sing

Fact 1: An animal needs to attract a mate to reproduce. Fact 2: Males sing to attract females. Given the two facts above, what do some animals do in order to reproduce?
****
A: sing

Fact 1: Vertebrates are all chordates that have a backbone. Fact 2: Fish are the first known true chordates. Given the two facts above, what was the first known animal with a backbone?
OPTIONS:
- pigs
- Birds
- sharks
- Elephant
- Dog
- Fish
- Human
- Man
Fish

Fact 1: Many corals secrete an exoskeleton that builds up to become a coral reef. Fact 2: Coral is calcium carbonate with a trade of carotene. Given the two facts above, a reef is made of?
OPTIONS:
- it keeps an organism warm
- salt and water.
- granite
- magnesium
- gastropod shells
- ocean water
- calcium carbonate
- zinc

Answer:
calcium carbonate