Invertebrates are animals which do not have a skeleton or a backbone.
Many invertebrate bodies are protected by shells or exoskeletons:
INVERTEBRATE CHARACTERISTICS AND GROUPS
We can learn more in this web:
Mostrando entradas con la etiqueta exoskeleton. Mostrar todas las entradas
Mostrando entradas con la etiqueta exoskeleton. Mostrar todas las entradas
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