A.T. Robertson Commentary 1 Corinthians 15:38

"but God giveth it a body even as it pleased him, and to each seed a body of its own." — 1 Corinthians 15:38 (ASV)

A body of its own (ιδιον σωμα). Even under the microscope the life cells or germ plasm may seem almost identical, but the plant is quite distinct. On σπερμα, seed, old word from σπειρω, to sow, see on Mt 13:24f.