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Red tides (algae blooms) are caused by:

Carbon is needed by living things to:

In the following food chain: grass is eaten by a caterpillar which is then eaten by a frog which is then eaten by a raccoon The producer would be:

A density dependent factor regulating population size would be:

Producers are important to an ecosystem for:

Acid rain is caused by:

The abiotic source of phosphorus is

The ultimate source of energy for humans is:

The biome where the majority of trees are adapted to prevent freezing during the winter is the:

The biome found in the Southern California coastline would be: