Chapter 4 Interactions Within Ecosystems D

Multiple Choice

Why was the production of oxygen by cyanobacteria about 3.5 billion years ago significant for life on Earth?

• It allowed the development of complex life forms.

• It caused mass extinction.

• It reduced the temperature of the planet.

• It increased the amount of carbon dioxide.

Multiple Select

Which of the following are consequences of using fossil fuels, as described in the lesson?

• Increase in greenhouse gases

• Ozone layer damage

• Decrease in biodiversity

• Reduction in water pollution