The number of chromosomes varies greatly between different organisms. Here's a breakdown:

* Humans: Have 46 chromosomes (23 pairs)

* Dogs: Have 78 chromosomes (39 pairs)

* Fruit Flies: Have 8 chromosomes (4 pairs)

* Rice: Have 24 chromosomes (12 pairs)

* Bacteria: Do not have chromosomes in the same way as eukaryotes. They have a single, circular DNA molecule.

Key Points:

* Species-Specific: Chromosome number is a characteristic feature of a species.

* Diploid vs. Haploid: Most organisms are diploid, meaning they have two sets of chromosomes (one from each parent). Some cells, like gametes (sperm and egg), are haploid, having only one set.

* Evolution: Chromosome number can change over time through evolutionary processes like duplication and fusion.

So, there's no single answer to how many chromosomes every organism has. It depends on the specific species!