How long have ecosystems existed
because it can
yea dua they can be any were
There are Many ecosystems but there is one main one it goes like this - microrganisms---->zooplankton---> Whale------>Shark-----> Decomposers
Ecology is the study of ecosystems. These involve the interconnected relationships between the various organisms that exist in nature as well as their habitats.
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We do not know of any alien lifeforms as of yet, so if they do exist we do not know how their biology works. Most ecosystems on Earth depend on sunlight, so it is likely that any ecosystems on other planets would as well.
yes. they serve the function of "predators" in most ecosystems in which they exist.
Ecosystems
Yes in fact damaged ecosystems can be restored but it takes a long long time.
No.
All living organisms live on the crust of the earth. This is called the biosphere and contains all the ecosystems in the world.
Ecosystems that are established on land (as opposed to Marine ecosystems).