| Direct development | Indirect development |
|---|---|
| $(1)$ In this type of development,there are no larval,nymphal,or other intermediate stages in the life cycle between the egg (or birth) and the adult. | $(1)$ In this type of development,the organism passes through one or more larval or nymphal stages before reaching the adult form. |
| $(2)$ Example: Mammals,birds,and reptiles. | $(2)$ Example: Echinoderms,many insects (arthropods),and amphibians. |
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