As animals have evolved large body size, they have also evolved adaptations to improve the exchange of energy and materials with the environment. for example, in many larger organisms, evolution has favored lungs and a digestive tract with

a. increased thickness
b. more branching or folds
c. larger cells
d. decreased blood supply

b. more branching or folds

Explanation:

Animal size has increased during evolution on several animals, this has favored enhancements in gas exchange because this enlargement made diffusion too slow to cover internal distances in an efficient time, therefore branches and foldings were developed to cover distances quicker.

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this is more of a statement than a question. is there answers to go along with this, or is it opinion based?