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What evolutionary advancements do the cnidarians have that are not present in poriferans?
Cnidarians exhibit several evolutionary advancements over poriferans, including the development of true tissues and a simple body plan with distinct cell layers (ectoderm and endoderm). They possess specialized cells called cnidocytes, which contain stinging organelles (nematocysts) used for capturing prey and defense. Additionally, cnidarians have a nerve net that allows for more coordinated movement and responsiveness to environmental stimuli, unlike the more rudimentary cellular organization found in poriferans. These features enable cnidarians to be more active and complex organisms in their ecological roles.
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Are organs present in cnidarians?
no
What presence of segmentation do cnidarian's have?
The is no segmentation present in cnidarians
What is diploblast?
Diploblasts are organisms that develop from two primary germ layers during embryonic development. These layers are the ectoderm (outer layer) and endoderm (inner layer), with no mesoderm present. Examples include cnidarians like jellyfish and coral.
Do porifera have nerve cells?
No , Poriferans lack typical neuron cells but they possess some neuron like cells which regulate flow of water . These cells are present around porosites .
What are the appendages in cnidaria?
Appendages in cnidarians are called tentacles . They are used in food capture and defense . Stinging cells are present in tentacles .
What is a simle nervous system?
A nerve net or diffused nervous system is called simple nervous system as present in cnidarians .
What is an evolutionary?
If two organisms share an evolutionary relationship, that means that they have a common ancestor on the evolutionary tree. The more recently the shared common ancestor lived, the more closely related the two present organisms are, evolutionarily.
Which structure has been present in Earth's living organisms for the least amount of evolutionary time?
The flagellum is a structure that has been present in Earth's living organisms for the least amount of evolutionary time. It is a whip-like appendage used for movement and is found in various unicellular and multicellular organisms across different evolutionary lineages.
How long have cnidarians been on earth?
The earliest animal fossils where rather modern-looking cnidarians, possibly from around 580 millionyears ago. They've been around for a long time!The earliest animal fossils where rather modern-looking cnidarians, possibly from around 580 millionyears ago. They've been around for a long time!They are present in fossils form since Cambrian times , and were present in Proterozoic Era .
What are some examples of specialized cells present in cnidarians?
Some examples of specialized cells in cnidarians include cnidocytes (stinging cells) used for defense and capturing prey, sensory cells for detecting movement and light, and muscle cells for movement and contraction. Additionally, some cnidarians have specialized cells that secrete mucus or digestive enzymes for feeding.
What phylum was not present during the Cambrian period?
The phylum Cnidaria was not present during the Cambrian period. Cnidarians, which include jellyfish and corals, appeared later in the fossil record during the Ediacaran period and diversified in the subsequent periods.
What are the five evolutionary forces that act on the hardy weinberg principle?
The evolutionary influences present in the Hardyâ??Weinberg principle are mate choice, mutation, selection, genetic drift, gene flow and meiotic drive.
