Помогите срочно пожалуйста !!!!!!!!!!!!!!! Даю 55 балов !!!!!!!!!!!!!!!!!!!!!!!!!! fill in the gaps with the correct preposition.They,correct the statements.Compare with your partner.
1.Life.............Earth arose in an oxygen-rich environment.
2.Our bodies process oxygen.............. 100% effectiveness
3.Oxygen has always been present................. the atmosphere.
4.The appearance of photosynthesis............ plant is known as the Great Oxidation Event.
5.Evidence suggests animal life appeared....................
land and.............. the oceans................ about the same time.
6. Land animals depend................. land plants for most of their oxygen

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