0:03 an ecosystem is a community of living
0:05 organisms interacting with each other in
0:08 the environment around them ecosystems
0:10 are built from Plants upwards as they
0:14 harness CO2 and water and using the
0:16 sun's energy plants create energy
0:18 containing molecules which are
0:20 carbohydrates this is why they are often
0:23 referred to as primary producers or
0:25 autot trops within the
0:28 ecosystem these molecules provide energy
0:31 for all living organisms in an ecosystem
0:34 all other organisms that do not
0:36 photosynthesize are considered consumers or
0:38 or
0:40 heterotrophs many molecules along with
0:43 energy are cycled in an ecosystem as
0:45 organisms transfer them from one
0:48 individual to another one of the most
0:50 typical transfers is when one organism
0:53 consumes another the molecules and
0:55 energy that made up the consumed
1:00 organism is either lost as heat or it
1:02 expelled such as carbon dioxide or
1:05 excreted nitrogenous waste and the
1:07 remaining molecules are integrated into
1:09 the consuming organisms
1:12 biomass Cycles are often completed by
1:14 death and Decay which is vital for all
1:16 organisms as they return many vital
1:20 nutrients to the producers and the
1:22 atmosphere ecosystems are incredibly
1:25 dynamic as populations of organisms
1:27 increase and decrease and climatic
1:30 conditions always alter some ecosystems
1:32 can be very stable in that they change
1:35 very little over long periods of time
1:37 generally the more diverse an ecosystem
1:39 is the more stable it will
1:42 be sometimes the only event that will
1:44 alter these ecosystems is a natural
1:46 disaster such as an earthquake or a
1:50 volcanic eruption or even a large scale
1:54 fire worry not though ecosystems recover over
1:55 over
1:57 time coral reefs are an excellent
2:00 example of a diverse ecosystem that has
2:04 existed for as many as 500 million years
2:06 the coral actually has a symbiotic
2:08 relationship with tiny Ali which are the
2:11 producers in the ecosystem from whale
2:14 sharks to pistol shrimp from C cucumbers
2:16 to fighter Plankton this ecosystem is
2:18 teaming with more organisms and
2:20 interactions than there are bases in a
