12. suppose that there has been a sudden

growth of algae in a lake in cottage country.

(a) suggest three possible causes for this

situation.

(b) explain what could happen in the lake.

Which ideas did your answer contain? check all that apply. no food for organisms no oxygen in the atmosphere no trees or flowering plants no products based on trees or plants (building materials, medicines, fuels, fibers) no fossil fuels

Which type of respiration takes place when there is no oxygen present? a. anaerobic b. mitochondrial c. cellular d. aerobica. anaerobic

What materials must dams have to produce electricity, and what must occur?