Problem:OPTIONS:
- potash
- food
- CO 2
- sugar
- urea
- liquid
- H 2 O
- sulfur

Fact 1: Urine is the liquid waste product of the body that is excreted by the urinary system. Fact 2: Mammals excrete urea in the watery form of urine . Given the two facts above, what is a waste product of the body that is excreted by the urinary system?
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A: urea

Problem:OPTIONS:
- Energy.
- water
- blood
- Energy
- sodium
- copper
- positive
- ice

Fact 1: Minerals are chemical elements that are essential for body processes. Fact 2: Copper is an essential mineral. Given the two facts above, what is a chemical element that is essential for body processes?
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A: copper

Problem:OPTIONS:
- scattered light
- chlorophyll
- Energy.
- sunlight
- Energy
- acetic acid
- Chemical energy
- energy usage

Fact 1: Fungi lack chlorophyll, so they cannot make food by photosynthesis as plants can. Fact 2: If the plant is green, it is a producer. Given the two facts above, what do fungi lack that make them unable to make food as producers can?
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A: chlorophyll

Problem:OPTIONS:
- dinosaurs
- animals
- fish
- Animal survival
- supersonic
- vertebrates
- invertabrates
- four limbs

Fact 1: Hair is a fiber that is found only in mammals. Fact 2: Mammals are vertebrates with fur or hair. Given the two facts above, what are mammals?
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A:
vertebrates