The evolution of which characteristic allowed for the development and enlargement of complex internal organs? segmentation tissue body cavity exoskeleton

The answer is body cavity.

Correct Body Cavity

The evolution of the body cavity allow the development of complex internal organs. It provides space to the organs to be contained in and perform their functions. In all the large and complex organism the body cavity is strong and and spacious in order to prevent organs from squishing into one another.

Hence, the correct answer would be Body Cavity.

when a reversible reaction is occurring in both directions at the same rate; the products and reactants do not change in concentration. a chemical reaction where the compound is broken into its constituent parts.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.