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Fill in: reversed, serving, combat, efficient, enzymes.

1 Scientists are trying to find ways to ...... the aging process and keep people looking young

2 Our bodies are more ........ at removing toxins from our cells when we are young, thán when we are old.

3 Eating a daily ....... of cooked tomatoes can help protect your skin against sun damage.

4 Scientists haven't just slowed down the aging process in mice; they have ...... it.

5 Telomerase is just one of hundreds of ...... involved in the aging process.