Let's start with the very simplest of animals, and the phylum Two layers to three are some of the most important bench marks in animal evolution. Take place from no layers to two layers, and from So the places in the animal family tree where these transitions Results in truly fundamental, and amazing changes. You can see how a not totally amazing sounding change in tissue Simplest phyla from animals with no layers at all, AKA sponges to the most basic of three Ither form two layers of early tissue, called germ Of specialized cells an animal has, the more complex it is. As you know, almost all animal cells are organized into tissues that perform specialized functions. Take things for granted or they think that reality TV is, reality. We've all meet in our lives, animals aren't considered simple because they apparently (upbeat music) Unlike those dullards that How animals are structured, and also how they evolved. But when it comes to truly simple animals, we shouldn't underestimate them, because the animal phyla that we describe as being the leastĬomplex actually offer us a vivid way of understanding We sometimes refer to themĪs simple or real housewives. You and I both know, people or dogs that we don't consider
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