A female dog raises a kitten along with her puppies, this relationship is example of:

Plants give the atmosphere:

Biomass means the amount of plants in an ecosystem, on a energy pyramid which level would have the greatest biomass?

Abiotic factors represent what in an ecosystem?

Photosynthesis is a form of:

Organisms that break down animal or plant material when it dies are called:

When a pond freezes, the top part freezes first. That is because:

How do plants return water to the atmosphere?

What is a producer?

What term best describes a symbiotic relationship in which one species is helped and the other harmed?

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