Most animal species are bilaterians: Pl-with bilateral symmetry and ___________ development -most have a coelom and a digestive tract with two openings
triploblastic development (ectoderm, endoderm, mesoderm)
Most animal species are bilaterians: animals with bilateral symmetry and triploblastic development -most have a coelom and a digestive tract with two openings.
Bilateral symmetry means that the animal can be divided into two halves that are mirror images of each other. This type of symmetry allows the animal to have a front and a back, a head and a tail, and a left and a right side. This feature is advantageous for movement and for sensing the environment.
Triploblasty means that during embryonic development, three germ layers are formed: the ectoderm, mesoderm, and endoderm. These layers give rise to the various organs and tissues of the animal.
A coelom is a fluid-filled cavity that forms within the mesoderm. This cavity provides space for the internal organs and allows them to move and function independently of each other.
The digestive tract with two openings, also known as a complete digestive system, consists of a mouth and an anus connected by a tube that allows food to pass through. This type of system is more efficient than the one-opening digestive system found in some animals, as it allows for specialized regions of digestion and absorption.
Overall, these features have contributed to the evolutionary success of bilaterians, as they have allowed for greater mobility, increased complexity, and more efficient nutrient processing.
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