![]() ![]() Their continued existence is evidence that they are well adapted for their habitats. Some, like the sponges you will read about in this concept, have existed virtually unchanged for hundreds of millions of years. However, simpler invertebrates evolved before insects. They are the most numerous animals on Earth. Invertebrates are animals without a backbone. In this way you can the reproduction directly affected by the water current as well as the reproduction being completely facilitated by the constant flow of water.\) Certain choanocyte cells will divide meiotically and become sperm cells that are released into the water current so that they can enter another sponge and be transferred by amoebocytes to an embedded sponge haploid egg. ![]() Concerning dispersal and reproduction, they go hand in hand. Finally the "used" water is pushed back out into the environment through the osculum. The water current pushes this water out of each radial canal, and then into the central cavity called the spongocoel. (It has no respiratory system) Thirdly, the waste elimination starts with a build up the water that is deoxygenated, and devoid of any food particles. Secondly, the individual cells acquire their oxygen directly from the water as it flows through the sponge. ![]() They then pass this food to the amoebocytes who then carry it to the other cells within the cell body. Firstly the choanocytes, as well as producing the current, also capture the food as it passes through. As the flagella of the choanocytes begin to beat a water current is built up, and as the water flows through it addresses the many needs of the sponge. ![]()
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