Living systems are organized in levels according to their structures and functions. Which word is missing from the organizational chart above?
A.
protons
B.
cells
C.
water
D.
bacteria

The most effective way to provide children with safety messages is to

For the united state human rights have been tied to support for

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