If father have blood group a and mother have blood group b what will be the blood group of born child? ?

They can either produce=a,b,ab or O

phylogenetic tree is the tree of life or evolution tree. it shows the different branches of evolution. the sequence goes like tissues - coelom - backbone - endoskeleton - segmentation

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."