■ safety goggles

■ clear, flexible plastic tubing (44 cm long)

■ 4 test tubes with stoppers

■ graduated cylinder

■ brine shrimp culture

■ aluminum foil

■ methyl cellulose

■ fluorescent lamp or grow light

■ 14 pieces of screen or thin cloth

■ calculator


1. Recall that a species' habitat is a specific area where it lives.

2. A species habitat selection depends on how well the location fits within the species' tolerance range. The more optimal all limiting factors are within a portion of an organism's range, the more likely the organism is to select that area for its habitat.

3. What limiting factors might be involved in habitat selection?

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