Approximately how much of the solar energy that falls on the leaves of the plant is converted to chemical energy by photosynthesis?

1. Less than 1%

2. 2-10%

3. 30%

4. 50%

If the carbon atoms fixed by producers already have passed through three species, the trophic level of the last species would be

1. scavenger

2. tertiary producer

3. tertiary consumer

4. secondary consumer