Biodiversity & Human Impact Review

What happens when species population become so small or isolated? Select all that apply.

• Inbreeding occurs which causes flaws or disabilities to be passed on

• The gene pool becomes smaller causing the genetic diversity to be smaller.

• Reduces the traits that allow species to survive in times of environmental change

• The gene pool becomes more variable

Which of the following will lead to fewer deaths of large numbers of animals in an area?

• People building homes in a smaller area.

• People taking the land to build new houses, causing the animals to lose space to live and find food.

• People removing too many nutrients and resources from the land, causing the animals not to have any food.

• People polluting the land, causing the animals to get sick.

How have human activities influenced the spread of invasive species?

• Human actions are causing the spread of invasive species to new ecosystems.

• Invasive species are more controlled due to human actions.

• The spread of invasive species is unrelated to human actions.

• Invasive species are experiencing high extinction rates due to human actions.

Which human activity has a positive impact on ocean fish populations?

• Allowing trash dumping into the oceans.

• Improved technology for catching fish.

• Allowing fishermen to catch as many fish as possible.

• Decreasing the amount of pollution that enters the oceans.

Which statement about human impacts on other living things is TRUE?

• Human activity mostly impacts animal species, but not plants.

• The number of endangered and extinct species is increasing because of human activity.

• The number of species that are going extinct because of human activity is balanced out by new species being formed.

• Human activity has only had a small impact on other species compared to natural causes.

Invasive species are animals that...

• take over a new habitat.

• destroy human homes.

• leave habitats.

• destroy their own habitat.

Which of these human actions is MOST harmful to a lake ecosystem?

• Making rules to limit the amount of fishing in the lake.

• Allowing pollution to enter the lake from nearby farms.

• Making rules to limit the speed of boats on the lake.

• Researching plants and animals that live in the lake.

Which of these human activities decreases the amount of land available for other living organisms?

• Overuse of fertilizers.

• Building increasingly larger cities.

• Disposal of industrial waste.

• Release of air pollution.

When will the human population become too large to be supported by Earth?

• When the number of people exceeds the planet's carrying capacity.

• When people have used up all the fossil fuels that provide energy.

• When the number of people reaches ten billion.

• When people can no longer buy luxury items.

Why do the populations of invasive species grow so quickly?

• Invasive species are native to an area

• Invasive species are prey to many animals

• Invasive species have no predators

• Invasive species keep the ecosystem in equilibrium