- List 4 types of species/species interactions found within most communities. Wh

Question

- List 4 types of species/species interactions found within most communities. Which type of interaction is - (negative) to both species involved? - Organisms are found where they are on Earth because A)______ B)_______or C)________ - Once an organism is in an area what 3 factors determine whether it stays in that area for a long time? (Long term distribution patterns are determined by...) A. ________ B________ & C._________ - If a species is said to be a "keystone species" in its community, what does that mean? Give one example (name of species and its community)

Explanation / Answer

Answer:-

A.4 types of species interactions-competition, predation, commensalism, mutualism and parasitism.

B.competition.

There are three main types of abiotic factors:

climatic factors consist of sunlight, atmosphere, humidity, temperature, and salinity;

edaphicfactors are abiotic factors regarding soil, such as the coarseness of soil, local geology, soil pH, and aeration;

and social factors include land use and water availability.

**Keystone species:-

keystone species. (k'stn') A species whose presence and role within an ecosystem has a disproportionate effect on other organisms within the system.

**A keystone species is often a dominant predator whose removal allows a prey population to explode and often decreases overall diversity.

Example for keystone species:-

**In this ecosystem, the sea star was the keystone species. The sea otter is another example of a keystone species in the Pacific Northwest. These mammals feed on sea urchins, controlling their population.

**If theotters didn't eat the urchins, the urchins would eat up the habitat'skelp.

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