Question

1. consider the observations you have made and then order the statements below. first a - algae die because levels of growth cannot be supported. - bacteria break down algae using dissolved oxygen in the process, which decreases dissolved oxygen levels. - a positive feedback loop has been created: less dissolved oxygen leads to more dead organisms which leads to more decomposition which leads to even lower dissolved oxygen. - an extra input of nutrients feed algae. - algae grow and form algal bloom.

Explanation:

Step1: Initial event

An extra input of nutrients feed algae.

Step2: Algae growth

Algae grow and form algal bloom.

Step3: Algae decline

Algae die because levels of growth cannot be supported.

Step4: Decomposition by bacteria

Bacteria break down algae using dissolved oxygen in the process, which decreases dissolved oxygen levels.

Step5: Feedback loop

A positive feedback loop has been created: less dissolved oxygen leads to more dead organisms which leads to more decomposition which leads to even lower dissolved oxygen.

Answer:

1. An extra input of nutrients feed algae.
2. Algae grow and form algal bloom.
3. Algae die because levels of growth cannot be supported.
4. Bacteria break down algae using dissolved oxygen in the process, which decreases dissolved oxygen levels.
5. A positive feedback loop has been created: less dissolved oxygen leads to more dead organisms which leads to more decomposition which leads to even lower dissolved oxygen.