Exercise 19. Answer the following questions

1. What is the biosphere composed of? 2. What bombarded the surface of the primitive Earth? 3. What is the biosphere characterized by? 4. What do organisms always contain? 5. How do plants utilize sunlight? 6. What were the oceans and the lands teeming with? 7. How are living communities and their nonliving environment interrelated? 8. How do living communities and their nonliving environment interact? 9. What is a forest considered as an ecosystem? 10. What does the abiotic portion of each ecosystem include? 11. What does the biotic portion of each ecosystem include? 12. How may ecosystems be subdivided? 13. What is a community? 14. What is the progression toward at each successive level? 15. What are terrestrial ecosystems based on? 16. What are the primary producers? 17. What are the consumers?

Exercise 20. Give definitions of:

The lithosphere animals.

The hydrosphere by-product.

The atmosphere is the air.

A community a process.

Photosynthesis microorganisms.

Oxygen are the rock and soil.

Abiotic the water.

Primary producers a collection.

Decomposers nonliving.

Consummers green plants.

Exercise 21. Do the following tasks first in writing then orally.

Describe the primitive Earth. 2. Characterize the biosphere. 3.Describe the evolution of simple organisms. 4. Prove that lake is ecosystem. 5.Prove that forest is ecosystem. 6. Say what the abiotic portion of ecosystem includes. 7. Say what the biotic portion includes. 8. State the community. 9.Describe aquatic ecosystem.

Exercise 22. Make up the annotation to the following text in English and retell the text "Global Ecosystem ".