Explanation:
Prothallus is a small, flattened multicellular structure that represents the independent gametophyte generation in pteridophytes, e.g., club mosses, horsetails and ferns. In some of the pteridophytes a single prothallus bears both male and female sex organs. In others there are separate male and female prothalli.
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$1.$ meiosis is important process for evolution.
$2.$ in meiosis $-II$ mother cell is haploid.
$3.$ In anaphase $-II$ homologous chromosomes are differentiate.
$4.$ after meiosis, each daughter cell has same $DNA$ strands.
$I.$carboxylation $II.$ ligation $III.$ reduction $IV.$ regeneration
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