The negative effects of tilling include a increased soil erosion b reduced soil drainage c reduced need for energy input d improved crop production

A

Explanation:

Tilling agitates the topsoil and removes ‘unnecessary’ vegetation so the main crop can grow without competition. Tilling improves soil aeration and drainage for plants to grow well.  Nonetheless, it can lead to other consequences such as soil erosion because it loosens the soil and makes it easy to be carried away by wind and water.

1. dermis

2. chemical

3. urine

4. viruses

5. antibodies