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hello have a nice day,,, For that question, only phylum mollusca does not have a germ layer.. am i correct??
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∙ 15y ago
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Which of the animal phyla was the first to evolve three germ layers?
The first animal phylum to evolve three germ layers was the Cnidaria. These germ layers are the ectoderm, endoderm, and mesoderm, found in more complex animals for the development of different structures and organs.
What phylum has 2 layers of tissue?
The phylum Cnidaria has two layers of tissue: the outer epidermis and the inner gastrodermis separated by a jelly-like mesoglea layer. This simple body plan is characteristic of organisms like jellyfish and sea anemones.
Is platyhelminthes diploblastic?
Yes, platyhelminthes are diploblastic, meaning they have two primary germ layers during embryonic development: the ectoderm and endoderm. They lack a mesoderm layer.
What is the phylum traits for a leech?
Leeches belong to the phylum Annelida, which is characterized by segmented bodies, a lack of internal or external skeleton, and bilateral symmetry. Leeches also have a closed circulatory system, a well-developed nervous system, and a body covered in a layer of cuticle.
What phylum is also known as phylum nematoda?
Phylum Aschelminthes
What marks the beginning of a germ layer development an embryo?
Gastrulation is first step towards germ layer development .
What germ layer is the tongue?
The tongue is derived from the ectoderm germ layer during early embryonic development.
Which of the animal phyla was the first to evolve three germ layers?
The first animal phylum to evolve three germ layers was the Cnidaria. These germ layers are the ectoderm, endoderm, and mesoderm, found in more complex animals for the development of different structures and organs.
What phylum has three germ layers?
The phylum that has three germ layers is the Chordata phylum. This phylum includes animals with bilateral symmetry and a notochord, which gives rise to the three germ layers (ectoderm, mesoderm, and endoderm) during embryonic development. Examples of Chordata include vertebrates like mammals, birds, reptiles, amphibians, and fish.
What germ layer is Melanocytes?
Melanocytes are derived from the neural crest, which is a transient embryonic structure that forms from the ectoderm germ layer.
From what germ layer does the mesoderm arise?
endoderm
What germ layer is the larynx derived from?
Ectoderm
Is trophoblast is present even as germ layer formation is occurring in human?
If your question is 'Is the trophoblast present during germ layer formation (i.e. gastrulation) ?' then the answer is YES
The primary germ layer that forms the brain and spinal cord is called what?
The primary germ layer that forms the brain and spinal cord is called the ectoderm.
What germ layer is nervous tissue found?
Nervous tissue is derived from the ectoderm germ layer during embryonic development.
Do arthropods have three embryonic germ layers?
Phylum arthropoda does fall under the Protostomia clade characterized by bilateral symmetry and three germ layers.
What are the layers in the gastrula?
The three primary germ layers in the gastrula are the ectoderm (outer layer), mesoderm (middle layer), and endoderm (inner layer). Each layer gives rise to different tissues and organs in the developing embryo.
