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- Porifera. These are the simplest multicellular organisms that possess a cellular level of body organization, They are all aquatic, found mostly in marine habitats, and a few are freshwater forms.
- Cnidaria. These are mostly marine entities, while few, such as hydra, are found in freshwater. These are diploblastic and depict a tissue grade of organization.
- Platyhelminthes. They are bilaterally symmetrical, triploblastic, and acoelomate. They resemble leaves because of their dorsoventral flattening and lack of segmentation.
- Nematoda. Their body is triploblastic and bilaterally symmetrical. They demonstrate organization at the tissue level. They lack both the respiratory and circulatory systems.
Feb 27, 2020 · The Kingdom Animalia is currently divided into 32 phyla (singular phylum). Generally speaking, people consider the animals of this world to be divided into two groups, the ‘vertebrates’ (those with backbones) and the ‘invertebrates’ (those without backbones).
Jul 31, 2022 · Currently, most biologists divide the animal kingdom into 35 to 40 phyla. Scientists develop phylogenetic trees, which serve as hypotheses about which species have evolved from which ancestors
Currently, most biologists divide the animal kingdom into 35 to 40 phyla. Scientists develop phylogenetic trees, which serve as hypotheses about which species have evolved from which ancestors.
The Cambrian period, occurring between approximately 542–488 million years ago, marks the most rapid evolution of new animal phyla and animal diversity in Earth’s history. It is believed that most of the animal phyla in existence today had their origins during this time, often referred to as the Cambrian explosion (Figure 27.4.3).
Currently, most biologists divide the animal kingdom into 35 to 40 phyla. Scientists develop phylogenetic trees, which serve as hypotheses about which species have evolved from which ancestors. Recall that until recently, only morphological characteristics and the fossil record were used to determine phylogenetic relationships among animals.
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Currently, most biologists divide the animal kingdom into 35 to 40 phyla. Scientists develop phylogenetic trees, which serve as hypotheses about which species have evolved from which ancestors
