The answer of the first question is double fertilization !!! I don't get the second question so.... comment if you have that question !!!
This was a hard one but I did some research and I found this
Our genome has 3 billion base pairs so a naive calculation shows 3x10^36 different combinations. But that's a meaningless number. A lot of those variants would be silent mutations, i.e. changes in introns, repeated sequences, 3rd position codons, etc etc that would have no effect on the phenotype.
Hope this help
The process whereby organisms better adapted in to their environment tend to survive and produce more offspring.
Hopefully this helped?!!
Bones are made up of Calcium Phosphate given by the chemical formula, 
. When bones are kept in Hydrochloric acid, given by the chemical formula, HCl, they become soft because the calcium compound present in the bones changes its form. The following double displacement reaction takes place when the bones are kept in HCl,
---> 
Calcium chloride is water soluble, and gets washed away. This makes the bone thin and soft.
<span>The process in living organisms involving the production of energy, typically with the intake of oxygen and the release of carbon dioxide.</span>
