over time, they

[Ju]

***The soil in these places is so poor that the meat-eating plants doesn't have enough minerals to keep healthy. So these meat-eating plants have adapted over time by eating animals.***

1) What does it mean of "over time" in the above sentence?

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2) Can I use "they" as the plural of an animal, an insert and a book?

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Thanks.

 

[riverkid]

***The soil in these places is so poor that the meat-eating plants doesn't have enough minerals to keep healthy. So these meat-eating plants have adapted over time by eating animals.***

1) What does it mean of "over time" in the above sentence?

'over time' refers to amount of time that the evolutionary process that has occurred for these plants. It obviously is a long period of time.

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2) Can I use "they" as the plural of an animal, an insert and a book?

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Thanks.

Yup you sure can, Ju. 'they' is used both for humans and for all other plurals.