Question

1. describe evidence the algae in the tank are dying from hour 400 to 600. view time lapse of water color cell density - no change. - changes from clear to green. dissolved oxygen - changes from green to brown. water color e interpretation b d f

Explanation:

Algae are photosynthetic organisms. A decrease in cell density (no growth or decline), change in water - color from green (due to chlorophyll in algae) to brown (indicating breakdown of algae cells), and change in dissolved oxygen levels (algae affect oxygen production and consumption) can be signs of algae dying. When algae die, they break down and can cause these observable changes.

Answer:

Cell Density: A decrease in cell density can indicate algae are dying as there is no growth or a decline in the number of living cells.
Dissolved Oxygen: Changes in dissolved oxygen can be evidence. As algae die and decompose, the decomposition process consumes oxygen, altering the dissolved - oxygen levels.
Water Color: A change from green (characteristic of healthy algae with chlorophyll) to brown can be evidence of algae dying as it may indicate the breakdown of algae cells and release of other pigments or substances from decaying cells.