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Animals are used in scientific research to help us understand our own bodies and how they work. This is necessary to develop new medicines. Animals are also used to safety test potential medicines before they are tested in people and to check the safety of other chemicals.
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this sentence is parallel i think
The Weatherman predicted heavy Thunderstorms for the July fourth weekend, yet we planned our beach trip anyway. Hope this helps!
In terms of the first question, "They" would be an objective pronoun, but it should be noted that this does not have to be so. for the second, the answer is "my".