Type the number

Exercise and reference answers

Questions

1. Answer

   1869

   Question

   Year Haeckel first used the term ecology

2. Answer

   2

   Question

   Major types of ecosystem

3. Answer

   5

   Question

   Major biomes of the world

4. Answer

   3

   Question

   Minimum levels in a food chain

5. Answer

   5

   Question

   Maximum levels in a food chain

6. Answer

   1

   Question

   Billion years the atmosphere has kept its chemical balance

Instructions

Type the number only.

Explanation