How can primary sewage treatment be used as a source of biofuel? a.Fermentation of BOD allows ethanol to be produced b.After primary treatment, the water is clean enough to use for hydrogen fuel c.Lipids that collect on the surface can be collected for biodiesel d.The trickling filters captures sludge that can be used for hydrogen fuel

Part 1. Mention why you have wells that do not contain one of the reagents and explain their use Part 2.  Mention the wells that do not have a positive reaction. Why this happened?

What is the proper term for an organism whose optimum growth range is between 20 and 50C but can grow well at refrigerator temperatures? a. psychrophile b. psychrotroph c. hypophiles d. psychrobot

23. Ecological stability is the result of _______________, the tendency of a system not to change when disturbed,     and _________________, the ability of the system to recover.     24.  Which of the following is NOT a limiting factor in primary production?   Question 24 options:   A)  Red light   B)  Oxygen   C)  Micronutrients   D)  Water