Bryophytes exhibit two successive generations, gametophytes and sporophytes. These phases alternate each other. Name this phenomenon.

Explanation

### Step-by-Step Solution:

1. **Understanding Bryophytes**:
- Bryophytes are a group of plants that exhibit two distinct phases in their life cycle: the gametophyte phase and the sporophyte phase.

2. **Identifying the Phases**:
- The **gametophyte phase** is the dominant phase in bryophytes. It is haploid (contains half the number of chromosomes) and is responsible for producing gametes (sperm and eggs) through sexual reproduction.
- The **sporophyte phase** is dependent on the gametophyte for its survival. It is diploid (contains the full set of chromosomes) and develops from the zygote formed when the sperm fertilizes the egg. The sporophyte reproduces asexually by producing spores through meiosis.
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