Explanation:
Metamerism is true segmentation where external divisions correspond to internal divisions. The body is divided both externally and internally into number of segments (100-120) called metameres. E.g., In earthworm, genital papillae are present in 17lh and 19th segments and nephridipores are scattered all over body surface except first two. Metagenesis is alternation of two life forms in an organism. Metamorphosis is phenomenon of passing through different juvenile stages before attaining adult form. Segmentation is division of- body into different segments and in some organisms, only external divisions are seen as head, thorax and abdomen.
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