I would advise that she either goes to her school library or a local library. If that is not possible, she could also ask her parents if they can schedule the visit to another date. She could also go to a friend's house anyway studying with friends is enjoyable and advantageous.
The evidence that supports the conservation law is that Carbon dioxide becomes glucose and oxygen during photosynthesis. The law of conservation of mass states that in a chemical reaction, mass is neither created nor destroyed.
The demonstrative pronoun (and the only pronoun in this sentence) is the word this, and it is a singular pronoun. The plural form would be - these.
I think the answer would be: How great human beings are.
Sorry If I'm wrong
