Type the number

Exercise and reference answers

Questions

1. Answer

   1

   Question

   Per cent of sunlight green plants capture

2. Answer

   10

   Question

   Per cent of energy passed to the next trophic level

3. Answer

   3

   Question

   Oxygen atoms in one ozone molecule

4. Answer

   4

   Question

   Trophic level of tertiary consumers

5. Answer

   1987

   Question

   Year UNEP forged the CFC freeze agreement

6. Answer

   1986

   Question

   Year whose CFC production level was frozen

Instructions

Type the number only.

Explanation