List the primary purpose of photosynthesis and what r the materials needed

they float because they are less dense than the water itself

something denser than water, like a rock, will sink to the bottom

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.