John Dalton believed which of the following about atoms?

Question

Atoms are real even though they're invisible.

All atoms of a single substance are identical.

The atom could be divided into smaller parts.

Atoms of different substances differ by weight.

It gives me the option to select more than one answer, so that makes me think that there's more than one answer here :S I know that the first one is an answer, but what are the others, if any?

Answer 1

Atoms are real an maybe atoms of diff elements differ by weight.

Because he said atom is the smallest part of an element so it means they can not be divided to smaller parts. only 1 an 4