razmnožavati

1. (with se) to reproduce; to multiply
   Zečevi se brzo razmnožavaju. — Rabbits reproduce quickly.
   Bakterije se razmnožavaju na toplom. — Bacteria multiply in warm conditions.
2. (of plants, animals) to propagate; to breed
   Ruže razmnožavamo reznicama. — We propagate roses from cuttings.
3. (of documents) to copy; to duplicate
   Sekretarica razmnožava materijal za sastanak. — The secretary is copying the materials for the meeting.

In the sense 'to reproduce' it is used with se.