Problem:OPTIONS:
- barnacles
- bacteria
- Most plants
- ferns
- orchids
- cacti
- PDAs
- Leeuwenhoek

Fact 1: Prokaryotes are single-celled organisms that lack a nucleus. Fact 2: Prokaryotes All bacteria are prokaryotes. Given the two facts above, what are single-celled organisms that lack a nucleus?
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A: bacteria

Problem:OPTIONS:
- energy
- mechanical
- staying warm
- Energy.
- heat energy
- Magnetism
- reduced heat
- power

Fact 1: If an object is made of a material then that object has the properties of that material. Fact 2: Objects made from iron and steel have the property of magnetism. Given the two facts above, what property does something made with iron have?
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A: Magnetism

Problem:OPTIONS:
- vaporization
- mouth of rivers
- fall down a hole
- rise and fall
- Condensation
- sink into the crust
- disappear forever
- It gets heated up

Fact 1: The gravitational pull of the Moon on Earth 's oceans causes the tides. Fact 2: Tides are the rising and falling of ocean's water. Given the two facts above, the gravitational pull of the Moon on Earth 's oceans causes water to what?
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A: rise and fall

Problem:OPTIONS:
- production of energy
- absorb light energy
- large building blocks
- sub-units of species
- cellulitis
- microscopic bulding blocks
- disease
- microorganisms

Fact 1: Cells are the microscopic building blocks of organisms. Fact 2: Plants and animals are organisms. Given the two facts above, what are cells in plants and animals?
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A:
microscopic bulding blocks