1. List 3 things that make it difficult for Mark to survive on Mars 2. Why did Nasa not want the crew to know that Mark was still alive?
3. How do you think Marks sense of humor helped him survive? Use 2 example from the movie
4. Explain how Mark is rescued.

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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.

sorry idk the answer well to you i have a explaination

explanation: a formula which shows the arrangement of atoms in the molecule of a compound

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.