Which include lobsters and crabs, have legs and, in the ocean, fill many of the ecological roles filled by insects on land.

the answer is d (apex) good luck : ))

label a cell membrane

label b cytoplasm

label c ribosomes

label d dna

the membrane forms the outside of the cell

cytoplasm is the liquid within

ribosomes are the components within that distribute rna

the dna is the genetic make-up

allowed for the prediction of the properties of missing elements.

multiplying and dividing the two decimals and the eqations by the same number of the overalls