They went from simple colonies of cells (such as some groupings of bacteria) to multicellular creatures with some cell specialisation.
Tissue is associated with the simplest animals. The most simple animal is considered to be the sea sponge because it lacks true tissue.
multicellularity
multicellularity ------------------------------------------------ Sponges are simple aggregations of single cells which come together for mutual benefit. If you liquidise a sponge, the cells it is made form will come together again to reform the sponge. Thus sponges (or something like them) were probably the first step in the evolution of multi-cellular organisms.
multicellularity ------------------------------------------------ Sponges are simple aggregations of single cells which come together for mutual benefit. If you liquidise a sponge, the cells it is made form will come together again to reform the sponge. Thus sponges (or something like them) were probably the first step in the evolution of multi-cellular organisms.
Clues can be found out about the evolutionary relationships of animals by studying fossil records.
The behavior of animals and humans can be studied with an evolutionary lens. This allows scientists to determine why certain behaviors were beneficial in evolutionary terms.
The evolutionary significance of Cnidarians is that they were the first animals to move. As for Porifera, they were the first animals on Earth.
Evolutionary theory is a scientific theory of the origin of species of plants and animals. It was developed by Darwin.
It showed that different-looking animals are actually related. It showed new evolutionary relationships between animals. it changed ideas about which animals were closely related
stuff
during the Prehistoric or the era of the dinosaur was evolutionary history of animals has there been an tendency for maximum body size to increase.
No other animals are believed to have evolved from sponges, thus they win the title of "an evolutionary dead end."
lobe-finned fish
lobe-finned fish