The first one, Added removed or changed. Mutation as in anything that would cause the slightest change.
The fetal membrane meets all the characteristics.
Hope it helped!
D. Lipids would be your answer
The answer would be B) Sponges, corals, worms, insects, spiders and crabs are all sub-groups of the invertebrate.
The axial skeleton consists of the skull, rib cage and vertebral column but her it looks like the appendicular skeleton
