A dominant allele can produce a dominant phenotype in individuals with one copy of the allele from one or both parents, but a for recessive allele to produce a recessive phenotype, the individual needs to have two copies, one from each parent.
G always pairs with C...So, if there is 30% G, then there's 30% C...which is 60%...that leaves 40% A+T - and you have to split this up too - so 20% Thymine (T) and 20% Adenine (A).
It is when the inclination of atoms of a dissolvable to go through a semipermeable layer from a less amassed arrangement into a more focused one, evening out the fixations on each side of the film.
I hope the answer will help you.
The correct answer is C. Sediment Pollution.