Which of the following is an example of cooperation among organisms? a. a flatworm attaches itself to the gills of a crab to obtain bits of the crab's food. b. army ants link themselves together to form a "bridge" so that their colony can cross a stream. c. a fly gets caught in a spider's web but escapes before being eaten. d. two cows graze upon the same pasture.

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.