The life cycle stage found in plants but not animals is the sporophyte stage.

Here's why:

* Plants have an alternation of generations: Plants go through two distinct life cycle stages: the sporophyte and the gametophyte.

* Sporophyte: The sporophyte stage is the dominant stage in most plants, producing spores through meiosis.

* Gametophyte: The gametophyte stage produces gametes (sperm and egg) through mitosis.

Animals, on the other hand, only have a diploid stage. They do not have a distinct, independent haploid gametophyte stage.