A city decides to build a hospital in one of its vacant lots instead of a sports center or a shopping mall. What are the trade-offs of building the hospital? A. The sports center B. The vacant lot C. The sports center and the shopping mall D. The sports center or the shopping mall

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