Animal classification is depicted below. Mark the correct option.

Answer: BSolution: During embryonic development, in reptiled, birds and mammals, embryo forms four membranes called embryonic membranes, chorion, amnion, allantois and yolk sac. Due to their occurrence, reptiles, birds and mammals are called amniotes. Fishes and ampibians do not have these membranes, hence they are called anamniotes. Milk producing mammary glands and hair are the characteristic features of mammals, whereas feather is of birds.