the branch of biology that studies heredity and variation in organisms | a voyage across a body of water (usually across the Atlantic Ocean) |
| traveling across |
| (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids |
| a path (often marked) where something (as a street or railroad) can be crossed to get from one side to the other |
| a junction where one street or road crosses another |
| a point where two lines (paths or arcs etc.) intersect |
| a shallow area in a stream that can be forded |