In the moss life cycle, the haploid stage starts with what structure?a.Archegoniumb.Gametophore and protonemac.Mature sporophyted.Spores

The haploid stage in the moss life cycle starts with the structure of spores. So, the correct answer is d. Spores.

Here's a step-by-step explanation:

1. The life cycle of mosses starts with the release of spores from the mature sporophyte.
2. These spores, which are haploid (contain a single set of chromosomes), germinate and grow into a new moss plant.
3. The new moss plant, called a gametophyte, produces gametes (sex cells) in structures called archegonia (female) and antheridia (male).
4. When conditions are right, the male gametes swim to the female gametes and fertilize them.
5. The fertilized egg (now diploid, with two sets of chromosomes) grows into a new sporophyte, which will eventually produce spores, and the cycle begins again.