Which of these structures are found in plant cells but not animal cells? 1. Cell membrane
2. Cell wall
3. Chloroplasts
4. Mitochondria

1 and 4

2 and 3

3 and 4

1 and 2

Which statement describes compounds a. compounds are made of one type of atom. b. compounds cannot be represented by models. c. compounds are represented by chemical formulas. d. compounds cannot be broken down into simpler forms.