Commensalism.
When it affects the other positively it's mutualism, when negatively it's parasitism.
It contributes to evolution, yes.
can a concrete hardner be used after dying concrete without affecting the color
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They are called symbiotic organisms. There are 4 basic forms of symbiosis: A "commensal" organism is one that lives in, on, or with another, and benefits in some way without affecting the other. (e.g. an orchid) A mutualistic organism is one that benefits and provides a benefit. (e.g. gut bacteria) An "amensal" organism does not benefit, but does harm. (e.g. accidental predation) A "parasite" (parasitic organism) is a plant or animal that lives on or within another living organism at the expense of that organism. (e.g. toxic bacteria)
Living organism without organized nucleus.
A single-celled organism without an organized nucleus is a prokaryote.
A single-celled organism without an organized nucleus is a prokaryote.
An interaction in which one organism lives as a dependent off another organism without causing damage or interference is what a commensal relationship is.Specifically, the term comes from the medieval Latin word commensalis for "sharing a meal" (preposition com"together" + mensa "meal, table"). It may be considered controversial since it demands that the survival of the dependent is realized without affecting that of the independent organism. Some scientists suggest as commensalist the interaction of barnacles on whales.
Commensalism-The flatworm benefits from eating bits of food from what the crab ate. The Horseshoe Crab is unchanged as far as scientists know. Commensalism is a form of symbiosis that benefits one organism without affecting the other organism.
parasite is the organism that lives on other organism without any benefit to the host.
Hurricanes are very large systems and, being an ocean-born phenomenon, often impact coasts. Since many large cities are built on coasts it is difficult for a hurricane to make landfall without affecting a city or two.
poplations in the food web that could be changed without affecting other populations explain