Sponges are found to be multicellular lacking cell walls. They also produce sperm cells. They are found to be similar to other animals. They lack true tissues and organs and have no body symmetry unlike other animals.
The oldest evidence of animal life on Earth has been discovered. The evidence contains a compound produced only by sponges which dates back as far back as 635 million years ago. The evidences have been found by scientists in ancient rocks and oils from Oman, Siberia and India.
Sponges are known to be among the earliest forms of animal life. This remarkable discovery pushes the timeline back to at least 100 million years. This occurred before complex lifeforms erupted into existence which was known as ‘Cambrian explosion.’
Do sponges have brains?
They have no brain, and indeed no nerve cells. They do not even have a “nerve net” of neurons scattered through their bodies.
How do sponges breathe?
The breathing process of sponges involves in them breathing by taking oxygen from the water. They then filter through the pores and canals in their bodies. The carbon dioxide is then send out with the water that has been excreted.
What can be called the Cambrian Explosion?
A large oxygen spike during the ‘Cambrian Explosion’ was a way of development of many animal species. Scientists have speculated this theory since a long period of time.
Around 541 million years ago The Cambrian Explosion was formed. In this era a wide variety of animals were found to burst onto the evolutionary scene.
Recently it was found they are solely produced by demosponges. They have had proven the existence on the seafloor for about more than 600 million years ago.
The steroid structures produced by ancient and modern demosponges are found to be different according to research team.
This black shale, formed 450 million years ago, contains fossils of trilobites and other organic material that helped support these increases in oxygen.