Question

1. describe evidence the algae in the tank are dying from hour 400 to 600. view time lapse of water color observation interpretation cell density - decreases b dissolved oxygen c d water color doesnt change overall increase overall decrease f

Explanation:

When algae are dying, their cell density decreases as the number of living cells goes down. Algae perform photosynthesis which affects dissolved - oxygen levels. As they die, their photosynthetic activity reduces, and the dissolved oxygen may decrease because there is less oxygen production. The water color might not change significantly if the algae decomposition is not accompanied by the release of large amounts of pigments into the water.

Answer:

Cell Density - Observation: Decreases, Interpretation: Number of living algae cells is reducing.
Dissolved Oxygen - Observation: Overall decrease, Interpretation: Less oxygen production due to dying algae.
Water Color - Observation: Doesn't change, Interpretation: Algae decomposition not releasing significant pigments into water.