The answer is 4. This is the answer because in order to maintain a pest free environment without harming the farm or forest, certain measures must be done. The use of a ladybugs as predators is one way killing aohids naturally.

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The answer is 3. Other choices all had negative effects on the environment, unlike in the use of reforestation, other human,

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The answer is 3. The function of roots in forests or trees is to hold the soil in place as well as absorb the water from heavy rains or floods. This reduces the risk for landslides and flash floods.

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The answer is 2. Wildlife refuges serve as a place for preserving wildlife. Usually, those that are endangered are kept inside these facilities and are bred until they are ready to be released and reintroduced again in the wild.

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Original habitats for species when cleared or used for agriculture or other infrastructures could lead to a decrease in population of a certain species. This is because the chances of reproduction becomes decreased, food resources also becomes decreased and the place wherein mating could occur can become affected also.

The answer is 2. The diversity of species becomes decreased thereby creating only one kind of food for a specific insect. Unlike if there is diversity in species of crops or plants, only specific plants or crops would be eaten by a specific insect.

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The answer is 4. By introducing fish species to the swamps, there could be a chance that mosquitos would leave the swamp because fish may eat their eggs thereby would not be able to reproduce again.

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By doing this method, it could benefit both the resident and the bat. For the resident, having bats around could repel insects and for the bat, they would have a constant food source. The positive effect of this is the maintenance of homeostasis among consumers.

The answer is 4. Since the rabbits were just introduced there as a foreign animal, there are no predators that usually prey on that specific rabbit thereby increasing the population of the rabbit.

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The answer is 4. Upgrading resources to meet the demands of humans also has negative effects on the environment. For example, since there is an increase in population size, the need for land for houses and the need for land for food resources are needed. As a consequence of needing all these, natural habitats or forests are destroyed in order to make way for the increasing demands of a certain population.

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The answer is 3. In order to prevent the extinction of certain species, human intervention may also be of help. Managing wildlife activities as well as the population of every species could be of help. Another way to prevent this is by capturing certain species for mating.

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The answer is 4. Taking them away from their habitat could be a great risk if the lizards would be able to adapt in the sudden change of environment. The best way is to monitor how the lizard would adapt to its new environment with the ongoing infrastructure.

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The answer is 3. As seen in the chart, the methods listed were ways on how to prevent pests. Usual pesticides include chemical which greatly harm the environment but the methods listed are ways to prevent pests but does not release or involve chemicals that harm the environment.

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