For a desert Cactus, which of these is NOT an environmental factor?

• air
• sand
• seaweed
• water

Which of these is an environment?

• pollution
• temperature
• brine shrimp eggs
• a terrarium

An environment where a plant grows the best is its

• aquatic environment
• optimum environment
• preferred environment
• terresterial environment

Moisture level is one example of 

• an environmental factor
• an optimum condition
• an organism
• an environment

If an organism cannot survive the temperature in a particular environment, then that environment MUST

• have a temperature OUTSIDE of the organism's range of tolerance.
• have temperature within the organism's range of tolerance.
• be the organism's optimum environment.
• be too hot for the organism.

Brine shrimp can live in water that goes from slightly salty to very salty. Brine shrimp live BEST in water that is mildly salty. Mildly salty water would be considered the bring shrimp's

• range of tolerence
• aquatic environment
• terrestrial environment
• optimum environment

Which of these is a living environmental factor?

• temperature
• rock
• light
• grass

Lisa has set up a small aquarium by putting some snails, gravel, plastic plants, and rocks in it. Which of these is likely to be responsible for the biggest change in the acidity of the water?

• snails
• gravel
• plastic plants
• rocks

Which of the following sentences is correct?

• The range of tolerance is within the optimum conditions.
• An optimum condition is within the range of tolerance.
• An optimum condition is outside the range of tolerance.
• The range of tolerance and the optimum condition are the same thing.

Few people live on the continent of Antarctica because...

• There is not enough drinkable water there.
• Temperature there is within the range of tolerance for people.
• It is not a preffered environment for people.
• It is an optimum environment for predators such as bears.