premise: if fossils of a water animal or plant are found in a place then that animal or plant used to live in that place sent2: shell is a part of a mussel sent3: a river usually contains freshwater sent4: fossils of shells of freshwater mussels are found in a mountain range sent5: a freshwater mussel is a kind of mussel sent6: a mountain range is a kind of place sent7: a freshwater mussel is a mussel lives in freshwater sent8: a mussel is a kind of water animal.
hypothesis: a cell nucleus, chloroplast and a cell wall are part of a plant cell