explain the Evolution of the reproductive organs from sponges to Chordates.
Some 750 million years agone, the last common spongey antecedent of all animals diverged, Pisani explained. One lineage became trendy sponges, and one gave rise to all or any alternative animals. Pisani and his team used information modeling to work out whether or not sponges or comb jellies were a lot of probably to possess been our ancestors.
Sponges are at a cellular level of organization and therefore don't have organs or perhaps well-developed tissues; however, they turn out spermatozoon and eggs and conjointly reproduce asexually. Some species of sponge area unit monecious, others area unit dioecious.
sperm and eggs area unit fashioned by aggregations of cells known as amoebocytes within the body wall; these don't seem to be thought-about gonads attributable to their origin and passing nature. Sponges reproduce each asexually and sexually. agamogenesis happens by
budding. Adult sponges turn out eggs and sperm. In several species, the same
individuals turn out each. However, they don’t turn out eggs and sperm at an identical
time. As a result, fertilization is unlikely to occur.
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