What organism is thought to be the first multi-cellular animal? The ancient sponge is thought to be the first multi-cellular animal.
How is it the same and different from animals today? Animals today are very diversed than sponges. Sponges survive through caring for themselves and finding mates to reproduce. Their ways of getting food usually involves movement by searching for it. They encounter competitions between their own kind as well as other creatures living in that habitat. Sponges are difficult to spot. They don't have a particular type of body that distinguishes themselves from other living creatures. They do not move from place to place in order to seek a better habitat, they adapt to their environment.
How do scientists know it’s an animal? Scientists can identify animals by its physical appearance and lifestyle. What evidence do scientists have to prove that other animals evolved from this organism? They've identified the genes in multi-cellular animals and compared it to that of the sponge. Every multi-cellular animal contained the same blueprint as that of the sponge's.
What more do you want to know? I want to know more of the life of a sponge and its ways of survival but more of how it came about.
