When Did The First Invertebrates Evolve? About 3.5 billion years ago, the first microscopic organisms appeared in the ocean. The first invertebrates developed in the oceans. They were soft-bodied animals with a shell or carapace, such as these trilobites. What were the first invertebrates to evolve? Sponges represent the first organism at the multicellular stage
How Did Life Start On Earth? Although the exact process by which life formed on Earth is not well understood, the origin of life requires the presence of carbon-based molecules, liquid water and an energy source. … Life on Earth began at the end of this period called the late heavy bombardment, some 3.8 billion
How Have Fish Satyed On The Earth For So Long? Somewhere around 430 million years ago, plants and colonized the bare earth, creating a land rich in food and resources, while fish evolved from ancestral vertebrates in the sea. It was another 30 million years before those prehistoric fish crawled out of the water and