Grammar help for a 7-year-old: Correcting sentences about Earth and animals

Original: Our EARTH is the only planet where we know life exists. From tiny bugs to giant whales, they enjoy living here.

Corrected (simple): Our Earth is the only planet where we know life exists. Tiny bugs and giant whales live here.

Step-by-step explanation (for a 7-year-old)

1. Capitalization: Use a big letter for names like Earth. So write Earth, not EARTH. Big letters at the start of a sentence are fine too.
2. Make the second sentence clearer: Instead of saying "From tiny bugs to giant whales, they enjoy living here," it is simpler to say who lives here: "Tiny bugs and giant whales live here." That tells the reader directly who you mean.
3. Short and simple is good: For young readers, shorter sentences with the subject first are easier to understand.

Extra example

Another correct way to write both ideas in one sentence: "Our Earth is the only planet where we know life exists, from tiny bugs to giant whales."

Quick practice

Fix this sentence: "our EARTH has many animals and plants."

Answer: "Our Earth has many animals and plants."