joe franklin attends lincoln high school, a large urban school near the apartments he shares with his parents and two sisters. On weekends he likes to get together with half a dozen longtime friends to hike, play cards, or listen to music. Q: Identify a primary group, a secondary group, a voluntary group, and an involuntary group that Joe belongs to.

Often, a goby fish and a shrimp will live together in a burrow the shrimp has dug in the sand. the shrimp is almost blind and therefore is unable to see predators approaching when he is outside of the burrow. when the shrimp is in danger, the goby fish touches the shrimp with its tail to warn him. then, both go back into their burrow for safety. which type of relationship does this represent? a. mutualism b. parasitism c. commensalism d. predator/prey