In an earlier chapter the characteristic of water called polarity was described as the attraction water molecules have for each other. Why is this a problem in the respirators system, and how is it solved? Make the distinction between air distribution and gas exchange in the respiratory system. Identify the organs that serve as air distributors and gas exchangers.

Monarch butterflies have brightly colored orange wings with black patterns on them, making them easily visible to birds that eat butterflies and moths, yet birds rarely eat the monarchs. likewise, the monarch caterpillars are brightly striped yellow and white and black, and they also are rarely eaten by birds, although some wasps will attack them and feed them to their young. what can be inferred from these observations? monarchs must threaten and attack birds, but not wasps. monarchs have a way of discouraging bird predation that does not involve hiding. monarchs’ wings are so colorful that most birds must find them difficult to eat. monarchs lay more eggs than other less conspicuous butterflies.