Explain why no ecosystem operates independently. give an example of an interaction between different ecosystems that could be seen in a food chain or a food web.

In every ecosystem, there are different organisms that interact with each other in a particular environment.  

The components of an ecosystem interact and interrelate with the ones that form part of another. Every ecosystem is related to another one.  

For example, in a food chain, a bird eats a fish, both animals belong to different ecosystems, but they are connected with each other.

c genetic engineering

yes its like the dead sea which is full of salt which makes you stay afloat

so yes an egg will float in salt