How were the Great Lakes formed?

Question 4 options:

The Great Lakes were formed by a huge flood that took place 200 years ago.

The Great Lakes were formed by a retreating glacier that dug out large basins. Then as the glacier melted, the water filled in those basins.

The Great Lakes were formed by heavy seasonal rainfall.

The Great Lakes were formed by the receding of ocean water as the continental plate rose.

The Great Lakes were formed by a retreating glacier that dug out large basins. Then as the glacier melted, the water filled in those basins

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water pollution kills aquatic life. aquatic life includes algae and other plant life that use photosynthesis. photosynthesis takes   c02 out of the air.  

c02is a greenhouse gas.

cytokinesis is the splitting of a cell membrane to form 2 identical daughter cells. it's similar to mitosis as both cells have identical copies of dna and cytokinesis is a step in the mitotic cycle.