Answer: Both a and b
Explanation:
The presence of C-C and C-H bonds in fat makes them insoluble in water as they are non polar: do not dissolve in water. These are rich in energy in that their breakdown produces more energy than even carbohydrates themselves.
Because the gene for the O blood type is common within in the gene pool.
It doesn't matter whether the gene is dominant or recessive, it matters on how on that ^
Evolution and diversity results from the interactions between organisms and their environments and the consequences of these interactions over long periods of time.