Test Prep GED Section 3 Science Exam Practice Questions (P. 5)

A species may live in association with another species. Such an arrangement is called symbiosis. Symbiosis in which both species benefit is called mutualism. If the symbiosis is beneficial to one species and neither beneficial nor harmful to the other, it is called commensalism. If one species benefits at the expense of the other, the relationship is called parasitism. A tick that attaches to the skin of a human or animal and feeds on its blood is an example of

An island in the Adriatic Sea was overpopulated with snakes. Sailors who came to the island brought and let loose mongooses, animals that feed on snakes. The population of snakes started decreasing, since the mongooses were eating them. The mongoose population started increasing since there was ample food around. The mongooses were not native to the island and there was no predator on the island to keep the mongoose population in check. At some point, there were hardly any snakes left on the island, and people started populating it. The mongoose, facing a shortage of snakes, started eating chickens that people kept for their eggs and meat. However, people caught on and protected the chickens from getting eaten. The mongoose population decreased. Some remain on the island, but their number is now at equilibrium, kept in check by the availability of food.

The passage illustrates -

An island in the Adriatic Sea was overpopulated with snakes. Sailors who came to the island brought and let loose mongooses, animals that feed on snakes. The population of snakes started decreasing, since the mongooses were eating them. The mongoose population started increasing since there was ample food around. The mongooses were not native to the island and there was no predator on the island to keep the mongoose population in check. At some point, there were hardly any snakes left on the island, and people started populating it. The mongoose, facing a shortage of snakes, started eating chickens that people kept for their eggs and meat. However, people caught on and protected the chickens from getting eaten. The mongoose population decreased. Some remain on the island, but their number is now at equilibrium, kept in check by the availability of food.
There were hardly any snakes left on the island because

An island in the Adriatic Sea was overpopulated with snakes. Sailors who came to the island brought and let loose mongooses, animals that feed on snakes. The population of snakes started decreasing, since the mongooses were eating them. The mongoose population started increasing since there was ample food around. The mongooses were not native to the island and there was no predator on the island to keep the mongoose population in check. At some point, there were hardly any snakes left on the island, and people started populating it. The mongoose, facing a shortage of snakes, started eating chickens that people kept for their eggs and meat. However, people caught on and protected the chickens from getting eaten. The mongoose population decreased. Some remain on the island, but their number is now at equilibrium, kept in check by the availability of food.
Which statement best describes the change in population of mongooses on the island?

There are four blood types in humans: A, B, AB, and O. An individual with blood type A has antibodies for B, so he or she cant receive type B blood. Similarly, a person with blood type B has antibodies for type A and cant receive type A blood. A person with AB blood type has no antibodies and can receive blood from anyone. A person with type O blood has both A and B antibodies and can receive blood only from someone else with type O blood. Based on this information, someone with type B blood can donate to