Ecosystem is a living system, where living organisms interacts with their environment and among each other.
Due to some hazardous processes like, Global warming, Green-house effect, increasing pollution, ecosystem is degrading.
We live in our Ecosystem, if it will get destroyed, our existence would be impossible. So, in order to save ourselves, we need to save it.
That's why biologists, concerned about ecosystem disruption
Hope this helps!
Hydrogen atoms are compressed
together by the enormous gravitational force
of the sun, causing them to fuse int a helium atom (which is heavier than
hydrogen), subatomic particles and enormous
release of atomic energy. The attached
picture shows the sequence of the main reaction
at the core of the sun.
This is the order:
Nominate, Nonsense, Obscure, Shimmer, Signal
I think it's oxygen and water because they are the substance for cellular respiration.