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A species that no longer exists where it once did, but is found in healthy numbers in other locations, is said to be:
A biotic factor is:
A cold, clear lake is called:
The type of soil that best holds onto water is:
What type of organism is always at the start of a food chain?
A species introduced to a new area replacing other native species is called:
Which of the following increased the population size?
The most reliable but hardest pyramid to construct is a pyramid of:
An organism that eats both plants and animals is called a:
How can carbon dioxide be removed from the atmosphere?
Which of the following is not an indicator of a polluted lake?
low dissolved oxygen.
high bacteria levels.
low biological oxygen demand.
The layer of gases around the earth is called the:
sugar + oxygen --> water + carbon dioxide + useful energy
This is the formula for:
Water carrying dissolved materials away from the soil is called:
Buildup of dangerous chemicals up the food chain is called:
Nitrogen is made into a useful form for living things by lightning and:
What trophic level gets the least amount of energy?
Humus is found in the:
The top middle of a lake is called the __?___ zone.
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