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MENINGKATKAN AKTIVITAS DAN HASIL BELAJAR MATERI SIKLUS MAKHLUK HIDUP MENGGUNAKAN MODEL PROBLEM BASED LEARNING (PBL) DIKOMBINASIKAN DENGAN TWO STAY TWO STRAY (TS-TS) DAN NUMBER HEAD TOGETHER (NHT) SISWA KELAS 4 SDN KOLAM MAKMUR BARITO KUALA