All plants have a life cycle. The first phase consist of a diploid sporophyte plant that produces spores. The second phase consists of a haploid gametophyte plant that produces sperm and egg. On moss, there are thousands of gametophytes attached to the soil by rhizoids which are like roots. The sporophyte grows up from the top of the gametophyte.
Source: Pg 567 and 565 Modern Biology
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