Mesozoa are simple, multicellular organisms typically composed of a few cell layers and are often categorized as having a bilateral symmetry, although some exhibit a more simplified structure. They generally lack specialized tissues and organs, consisting mainly of elongated, worm-like forms. Placozoa, on the other hand, are even simpler, consisting of a flattened, multicellular body that is only a few cell layers thick, with a dorsal and ventral side, and exhibit a unique, amorphous body plan without true symmetry. Both groups represent some of the most primitive forms of multicellular life, showcasing early evolutionary traits.
An example of a body plan with no definite shape is an amoeboid body plan found in unicellular organisms like amoebas. These organisms lack a fixed structure and can change shape constantly by altering the distribution of their internal components.
Changes in body plan can be influenced by mutations in key developmental genes, such as Hox genes, which regulate the spatial organization of body structures. Alterations in regulatory genes, like transcription factors, can also impact body plan formation. Additionally, changes in gene expression patterns during development can lead to modifications in the body plan of an organism.
the amoeba has no definite shape but changes due to the formation of pseudopodia
Animals whose basic body plan can be described as a tube within a tube are the bilaterians, including insects, mammals, reptiles, and birds. This means they have a central digestive tube (gut) within a central nervous system. This body plan allows for efficient organization of internal organs and specialization of body regions.
The phylum that has a body plan that is essentially a tube within a tube is the Phylum Platyhelminthes, which includes flatworms. They have a simple body structure with a digestive tract that is a tube running from mouth to anus along the central axis of their body.
are large, flat, amoeba-like creature up to 0.078 in (2 mm) in diameter; the grayish white body of the organism consists of several thousand cells that form two epithelia but are not organized into tissues and organs.
Placozoa
Phyla such as Porifera (sponges) lack organs and have asymmetrical or no specific body symmetry. Another example is Placozoa, which also lack organs and have asymmetrical body shapes.
the body plan
radial smmatree
Although most of the animal phyla are included in the deuterostomes and protostomes, cnidaria, porifera, placozoa and ctenophora are not included in the group of animals know as Bilateria (which contains the deuterostomes and protostomes). Cnidarians and ctenophores are in a group called Radiata, and Porifera and Placozoa are in the group known as Parazoa.
a cheetah body plan is to catch it's pray.....
angazi
The type of body plan a Dugesia has is an acoelomate body. This elongated body lacks internal structures for holding internal organs.
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The animal kingdom is divided into five groups for classification purposes. They are called Ctenophora, Porifera, Placozoa, Cnidaria, and Bilateria.
they are round