Guam is an island in the Pacific Ocean covered in tropical forests. During WWII (1940’s) the green tree snake was accidentally released on the island. Of the 12 species of native birds on the island 10 are extinct and the last two are extinct in the wild. Historically the birds have had little to no natural predators. The large populations of birds would eat the fruit and spread the seeds over large parts of the forest. The snakes’ diet consists completely on birds. With the birds gone many populations of trees are beginning to fall. Which of the following best explains what is happening on Guam?

Wildlife bridges are pathways that wildlife can use to avoid crossing a highway. A scientist wants to determine if wildlife bridges could help the endangered Florida panther. In 2017 there were an estimated 120-230 adult panthers in the wild. In 2019 27 panthers were killed by collision with vehicles. Wildlife bridges like the one shown below are being considered in an effort to protect the Florida Panther. How could a scientist best monitor if more wildlife bridges should be built to protect the panther?

Scientists are researching the relationship between two species of fish. They count the number of individuals in an isolated population of each fish and the number of individuals in an area where both fish are found together.

Species Avg. Isolated Population Avg. Population When

Found Together

Fish A 120 120

Fish B 45 230

Using the data from the table which type of relationship do these two fish have?