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:

When algae decompose, other organisms' cellular respiration causes a decrease in dissolved oxygen. Living algae perform photosynthesis which increases dissolved oxygen. A decrease in cell density, overall decrease in dissolved oxygen and a color - change from green to brown (as algae cells decay) are signs that algae in the tank are decomposing.

Answer:

Cell Density: Decreases; Dissolved Oxygen: Overall decrease; Water Color: Changes from green to brown.