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

living algae perform
photosynthesis, increasing
the overall dissolved
oxygen.

• living algae perform

photosynthesis, decreasing
the overall dissolved
oxygen.

• the decomposition of algae

occurs when other organisms
perform cellular respiration,
decreasing overall dissolved
oxygen.

• algae have green

chloroplasts. as the
population increases, this

Explanation:

Living algae perform photosynthesis which affects dissolved oxygen levels. A decrease in cell density, overall decrease in dissolved oxygen, and change of water color from green (due to chloroplasts in algae) to brown can be evidence. The decomposition of algae by other organisms during cellular - respiration also impacts dissolved oxygen.

Answer:

Decrease in cell density, overall decrease in dissolved oxygen, change of water color from green to brown are evidence that the algae in the tank are affected (dying or changing state).