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Some examples of worm-like creatures found in different ecosystems include earthworms in soil, nematodes in water and soil, and leeches in freshwater environments.

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What is evolution mean?

Evolution can be just a noun derived from the verb 'to evolve'. It means to develop, to change... There is an evolution of everything in this sense; evolution of language, evolution of one's knowledge of a book's characters as one progresses through a book, evolution of a garden as one plants more things, evolution of this answer as I progress through writing it, evolution of the sort of questions asked on WikiAnswers... However, the questioner most probably desires an explanation of biological evolution. This is known as the Theory of Evolution and Darwinism. It was made famous by its hypothesiser Charles Darwin. Since its hypothesis state it is now the greatest underlying theory of biology. It explains, along with its mechanism of Natural Selection, how organisms change over time. Gene frequencies change in populations of eukaryotes, genes are shuffled at eukaryotic meiosis and prokaryote genomes change by mutation. All these mechanisms bring about phenotypic change. Change is inevitable with the, not 100% faithful replicators, nucleic acids enclosed within the outer membranes of organisms. Change can be selected by Natural Selection. Not all phenotypes are suited to environments and those nonsuited are eliminated by Natural Selection and this further modifies gene frequencies in populations (in eukaryotes), giving more continuous scope for evolution. Evolution is traced via comparative genetics and genomics, comparative anatomy, comparative biochemistry and the fossil record. According to the Theory of Evolution, life started in the oceans. Bacteria like cells first appeared and eventually branched into myriads of other forms, prokaryotic and eukaryotic. Photosynthesis evolved and multicellularity evolved. Protists radiated, as did plants and animals. Plants took over the land as simple mosses and liverworts that were gametophyte-dominant. Gradually the gametophyte was reduced to a few cells in pollen grains of angiosperms and the sporophyte generation evolved fully dominant instead. Animals evolved from simple nerve-less and heartless organisms as sponges, eventually giving rise to both radiate and bilateral animals and among the latter, diploblastic and triploblastic lineages. On-substrate movement brought about cephalisation and as a result directionality was procured. From wormlike creatures with notochords (the larvae of urochordates), evolved fish and from lungfish and coelocanths evolved amphibians and from amphibians evolved reptiles and from reptiles evolved mammals and dinosaurs and from dinosaurs evolved birds. Among mammals, humans evolved from apes. It is incorrect to say that humans evolved from chimpanzees. Humans and chimpanzees evolved not FROM one another but WITH one another. Both arose from a common ancestor, a Pan-Homo common ancestor.


Related Questions

Vaginal bleeding during eight week pregnancy and wormlike structures?

What do you mean by "wormlike structures"? Am not sure what you are asking.


What are caecilians?

small wormlike limbless amphibians


How do you rid your yard of worms?

why would you want to when they improve the soil ? There are other wormlike creatures that are grubs, and you would want to carefully eradicate those by picking them out of the soil. If you use a pesticide, you risk killing the earthworms which are beneficial to your soil.


What is the Wormlike sac that outpockets from the cecum?

The wormlike sac that outpockets from the cecum is the vermiform appendix. It is a small, finger-shaped pouch attached to the cecum, a part of the large intestine. Although the appendix has no known essential function, it can become inflamed and infected in a condition known as appendicitis.


What invertebrates have no jointed legs are not wormlike lack true organs and have stinging tentacles?

Jellyfish.


What is the animal that emerges from a butterfly egg like a wormlike stage called?

A caterpillar hatches from the butterfly's egg.


Do trilobites eat brine shrimp?

Since all trilobites are extinct it is not possible to answer this question. However it is believed that most fed on dead or dying material as well as some species of ancient wormlike creatures. most trilobites would have been too large to live on brine shrimp, they were 10 to 25 inches long.


Describe the cycle of activity of the bombats?

Bombatus ursinus goes through three stages after hatching: Barva - a large brown, wormlike stage, predating on bucalypts. Bupa - a dormant stage, also known as a bhrysalis. Adult bombat - about 700 mm from snout to tail with a shuffling gait. These creatures live in burrows, and eat shoots and leaves.


Wormlike sac that outpockets from the cecum?

The wormlike sac that outpockets from the cecum is called the appendix. It is a small, finger-shaped pouch located at the beginning of the large intestine. The function of the appendix in humans is not entirely clear, but it is believed to play a role in the immune system. Inflammation of the appendix, known as appendicitis, can be a medical emergency and may require surgical removal.


What is the growing stage of complete metamorphosis?

The wormlike stage in a moth's life cycle is called the catapillar


What is the example of annelids animals?

earthworms, polychaete worms, and leeches, rag-worms


Why do you have wormlike movements in your body?

You are possibly thinking of the movements called peristalsis which pass along your gut. Peristalsis is a wave of contraction and relaxation of circular and longitudinal muscles which passes along the wall of the gut. Its function is to push food along.This movement could be described as similar to the contraction and relaxation of muscles in the body wall of worms during locomotion.