Animals from the deep cannot live near the surface, they are rarely seen.
for example the gaint squid... can grow to 20m long but never been found to live near the surface, its thought it can only take oxygen from cold water, when it gets to warmer surface water it suffocates.
to see animals in their natural habitat requires very expensive submarines, a human would be crushed due to the increased pressure at such depths.
ArTiFicAl EcoSytEmS- Oceans are natural ecosystems- they exist without the help from humans
There are many artfical ecosytems controlled by humans, a field of wheat is mainly artifical, farmers try to control what grows and lives there..
they use herbicides to remove weeds, they use pesticides to control pests, they cab increase the crop yeild by adding fertlisers...... Biodiversity descibes the rabge of living things, both plants and animals in an ecosystem, when a farmer uses pesticides etc he decreases the boidiversity of his farm
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