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Fill in the blanks
II. Fill in the blanks:
1. The physical and biological conditions in which an organism lives is its __________.
2. In a food chain, each position is known as a ________ level.
3. Those who feed directly on the producers in an ecosystem are called __________ consumers.
4. All green plants are _________ , whereas animals are consumers.
5. If the energy available at a trophic level is 100 units, the energy available at the level just below it will be about ___________ units.
6. The ozone layer protects us from ___________ radiation.