The correct option is (C) Tissues or no tissues.
The most ancient branch point in animal phylogeny is the characteristic of having Tissues or no tissues.
- Animals are eukaryotic, multicellular living creatures. Since they are heterotrophic, they only consume organic forms of stuff.
- They can be compared to autotrophs, which produce organic materials on their own. Between animals with genuine tissues and those without them, there is the most ancient branch point in animal phylogeny.
- The animal phyla Porifera and Cnidaria are divided by this branch point. The animal phylum Porifera contains sponges, whereas the animal phylum Cnidaria contains jellyfish. All of the other branch points appeared at a later stage in the evolution of mammals.
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