What is the difference between normal and sickle hemoglobin at the dna, rna, and protein (amino acid) level?

one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.

actually the answer is c