Answer:
The air would be too thin for most helicopters to create enough lift to remain airborne. And if somehow a helicopter did make it up there, landing wouldnt be easy.
Answer:
You can say:
Enzymes are soluble.
Enzymes are proteinous in nature.
Enzymes are sensitive to temperature.
Enzymes are sensitive to the activity or alkalinity of their environment.
Enzymes can br inactivated by inhibitors.
Answer : Aluminum
Explanation : Symbols are the short forms which are used to define an element. The given element has the symbol as 
is Aluminum in +3 oxidation state and is a cation which can donate its 3 electrons to other species.
Therefore, the answer is Aluminum.
Answer:
The function of DNA is storing the genetic information, like a bookshelf or a harddrive
