Answer:
Explanation:
(in an echinoderm) each of a large number of small flexible hollow appendages protruding through the ambulacra, used either for locomotion or for collecting food and operated by hydraulic pressure within the water-vascular system.
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Levels of organization in ecosystem:
1.Individuals or organisms
<span>2.Population- A group of organisms of a given species that live in a specific area at a given time</span>
<span>3.Comunity- All of the populations of different species that live in the same area and interact with one another</span>
<span>4. Ecosystem- Community (biotic) interacting with the environment (abiotic)</span> <span>5.Biome- A group of ecosystems sharing similar characteristics</span>
<span>6. <span>Biosphere-The sum of all the ecosystems established on planet Earth.</span></span>
Answer:
A. Helicobacter pylori
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