Label each part of this image, illustrating spermatogenesis.
diploid precursor cellsecondary spermatocyteprimary spermatocytesperm
1. Diploid precursor cell (larger cell on the left)
2. Secondary spermatocyte (smaller cell below the precursor cell)
3. Primary spermatocyte (smaller cell coming from the primary spermatocyte)
4. Sperm (final small cell on the right)