Which of these human activities is most likely to cause the excessive growth of Phytoplankton in the world’s oceans? Choose the best 2 answers.

The use of chemical fertilizers that are carried by runoff into rivers
The use of chemical fertilizers that are carried by runoff into rivers

The mining of fossil fuels, which requires digging underground tunnels
The mining of fossil fuels, which requires digging underground tunnels

The spraying of chemical herbicides that reduce carbon dioxide in the air
The spraying of chemical herbicides that reduce carbon dioxide in the air

The logging of old-growth forests, which results in erosion
The logging of old-growth forests, which results in erosion

Using fertilizers on your lawns