Question

As animals have evolved large body size, they have also evolved adaptations to improve exchange of energy and materials with the environment. for example, in many larger organisms, evolution has favored lungs and a digestive tract with ________. as animals have evolved large body size, they have also evolved adaptations to improve exchange of energy and materials with the environment. for example, in many larger organisms, evolution has favored lungs and a digestive tract with ________. decreased blood supply increased thickness more branching or folds larger cells

Answer 1

Evolution has favoured lungs and a digestive tract with more branching or folds.  
More branching or folding, provide a much greater surface area for lungs gas exchange to occur. For example, the alveoli have several adaptations to maximise the efficiency of gas exchange and one of them is that they are folded.

There are gastric folds in the mucosal and submucosal layers of the stomach which increase surface area for nutrient absorption during digestion.