Do echinoderms exist in external or internal fecundation
Do echinoderms exist in external or internal fecundation? Is there sex division between individuals?
Expert
The fecundation in echinoderms is external; gametes are discharged in water where fecundation takes place. The majority of echinoderms are dioecious with female and male individuals.
Explain why allantois is considered as an adaptation to the terrestrial life?
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