According to the timeline, all of the following statements are true except: a.
Slavery was banned west of the Mississippi River in 1820.
b.
The Louisiana Purchase doubled the size of the United States.
c.
Washington, D. C. has always been the capital of the United States.
d.
Lewis and Clark explored the northwestern United States in the early 1800s.

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