0
The earthworm is a segmented worm with a true coelom which is partitioned into separate segments. There are many internal structures that are repeated within each segment. Each segment is surrounded by both longitudinal and circular muscles allowing earthworms coordinated movement. The fluid filled coelom acts as a hydrostatic skeleton. Each body segment contains four pairs of chaetae, bristles that provide traction for movement. Also the first four segments make up the anterior head region of the external structure of earthworms. The first segment is the periostomium which bears the mouth and the anus is found in the last posterior segment.
My reference is my Biology 191 laboratory manual on invertebrates. (pg's 77-78)
What else can I help you with?
Earthworms were among the first organisms to display?
segmentation
What animal does not display segmentation?
Jellyfish do not display segmentation. They have a simple, non-segmented body structure compared to other animals like earthworms or insects.
What animals does NOT display segmentation A- human beings B-earthworms C-insects D jellyfish?
Earthworms and insects both display very apparent segmentation. Human beings are also considered to be segmented, with the upper and lower jaws, hyoid bone, vertebrae, and ribs are all evidence of this. Jellyfish do not display segmentation.
How is the increased complexity of the earthworm's digestive system related to segmentation?
The earthworms digestive system is increased in complexity because of the earthworm's segmentation. On each stop or segmentation there is a sphincter and its own digestion going on.
Which phyla has metameric segmentation in the body of animals?
Metameric segmentation is a characteristic feature of the phylum Annelida, which includes segmented worms such as earthworms and leeches. These animals have a linear series of body segments that are repeated along the length of their body.
Which of the folliwing ànimals does not display segmentation?
Among the listed animals, echinoderms, such as starfish, do not display segmentation. Segmentation refers to the division of the body into repetitive segments, which is seen in animals like annelids (earthworms) and arthropods (insects and crustaceans). Echinoderms have a unique body plan characterized by radial symmetry and a water vascular system, rather than the segmented structure found in other groups.
What is the difference between metamerism and segmentation?
Metamerism involves the repetition of body segments along the length of an organism, often seen in annelids and arthropods. Segmentation refers to the division of an organism's body into repeated sections with distinct functions, such as in earthworms with segments for movement and digestion. While metamerism focuses on repeated segments, segmentation encompasses a broader concept of division and specialization within an organism's body.
What did segmentation first arise in the annelids as an adaptation for?
Segmentation first arose in annelids as an adaptation for improved flexibility and movement. It allows for more specialized and efficient movement of the body, as each segment can move independently. Segmentation also allows for better control over body functions and increased survival capabilities.
What statement describe the action of earthworms in the soil?
B and C only..........plato users only
Does Metamerism occur in sea urchins?
Yes, metamerism occurs in sea urchins, although it is not as pronounced as in some other marine organisms. Sea urchins exhibit a form of metamerism known as secondary segmentation, where their bodies are organized into a series of repeating units. This segmentation contributes to their overall body plan and aids in their movement and feeding. However, the degree of segmentation is less evident compared to more distinctly segmented animals like earthworms.
Why are earthworms classified as annelids?
Earthworms are classified as annelids due to their segmented body structure, which is a defining characteristic of the phylum Annelida. This segmentation allows for greater flexibility and mobility, as well as specialized functions in different body segments. Additionally, earthworms possess a coelom, or body cavity, which is also a trait of annelids. Their segmented bodies, along with features such as a closed circulatory system and a segmented nervous system, further solidify their classification within this phylum.
What is hybrid segmentation of market?
segmentation is a creative prcess. marketers normally segment markets by combining several segmentation variables rather than relaying on a single segmentation base. THERE ARE 4 METHODS OF HYBRID SEGMENTATION * Value and Life Style (VALS) * psychographic-demographic segmentation * geo-demographic segmentation * yankelovich's mind base segmentation
