Why Are Sponges Considered Animals. In the past, zoologists considered them as. For colonial choanoflagellates to be considered animals, they would have to share a common ancestor with the animals and this ancestor would had to have occurred later in time than the common ancestor shared by unicellular choanoflagellates and animals.
This would imply that colonial choanoflagellates represent an evolutionary step towards the. Why are sponges considered unique in the evolution of animals? Reasons why and how sea sponges are considered alive sponges capture their food to eat.
The sponge would die if you did the same thing to it.
They show changes in the diameter of their central body cavity and are rapidly involved in the creation of distinct water currents with the help of choanocytes. Animals evolved only once, and the earliest branch is the sponges, says the data. All cells do pretty much the same thing; But rather captures tiny microorganisms and plants from the water that it lives.