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Q. Do echinoderms present external or internal fecundation? Is there sex division among individuals?
The fecundation in echinoderms is external, gametes are liberated in water where fecundation occurs.
The majority of echinoderms are dioecious with female and male individuals.
The peppered moth experiment was an example of directional selection; due to environmental conditions the directional selection shifted from one extreme to the other in 1850s Engla
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Giant chromosomes
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