Question

1. describe evidence the algae in the tank are

view time lapse of water color

observation
cell density ·decreases
dissolved oxygen overall decrease
water color ·changes from green to brown.
·the decomposition of algae occurs when other organisms perform cellular respiration, decreasing overall dissolved oxygen.
·living algae perform photosynthesis, increasing the overall dissolved oxygen.
·living algae perform photosynthesis, decreasing the overall dissolved oxygen.
·algae cells turn brown as the cells decay

Explanation:

Algae perform photosynthesis which affects dissolved oxygen levels. A decrease in cell density, overall decrease in dissolved oxygen, and water color changing from green to brown (as algae cells decay) are signs that algae in the tank are decaying. Living algae perform photosynthesis and increase dissolved oxygen, but the opposite observations here indicate decay.

Answer:

Cell density decreases, dissolved oxygen has an overall decrease, water color changes from green to brown. These are evidence that the algae in the tank are decaying.