Which example describes animals living in a social hierarchy? check all that apply. 1)a male peacock displaying its feathers to attract females 2)a worker bee defends the hive while the queen bee lays eggs two caribou that fight to live in a certain area 3)a prairie dog barks to alert family members when it spots a predator 4)a killer whale that lives and hunts alone in the ocean

The correct options are option 2 and option 3.

Explanation:

Honey bees are social insects that live like an organized family group. Bees can be up to 30000 in number in each group. Bees live in a hierarchy of three levels or it can state as three types of bees- The queen bee lays eggs, worker bee protects the hive and drone.

Prairie dogs are also social animals lives in family groups. these groups called coteries with an adult male, one or more adult female and their young ones. he prairie dogs use advance communication barks to alert the coteries when they spot any predator.

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

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