Which of the following is true concerning hull fouling from commercial shipping and recreational boating?
Why might it be beneficial to regulate what species of plants and animals people are allowed to own in particular environments?
Explain the relationship between overpopulation and diminishing water supplies.
Explain why water is critically important to most facets of human life.
Since invasive species did not co-evolve with the other species in the ecosystem where they were introduced _______.
Nonnative species disrupt ecosystems by _______.
Why might it be beneficial for governments to restrict the types of plants and animals that individuals can keep as pets in a particular environment?
For many exotic pet species, if they escape or are released into the environment they have the potential to become invasive and do extensive damage to the local environment. In order to preserve the local environment for everyone, it may therefore be beneficial to restrict individuals’ rights to own exotic species.
Which of the following is an example of chemical control of nonnative species?
Explain why the cane toad was a failure as a biological control method in Australia.
The cane toad was introduced into Australia to control the population of sugarcane beetles. However, upon introduction, the toads did not eat the beetle, but instead began damaging local ecosystems by preying upon other organisms and poisoning most animals that tried to prey on them.
What factor determines when a species is considered invasive?
Which of the following would be expected to have plentiful access to potable water?
Explain why the fact that invasive species did not co-evolve with the native species unbalances an ecosystem.
Because invasive species did not co-evolve with the other species of an ecosystem, they lack controls on their population, such as predators, that native species possess. As a result the population of an invasive species can grow uncontrolled and will eventually unbalance an ecosystem.
Based on California’s experience with Caulerpa, the killer algae, explain why it is important to regulate the pet and aquarium trade.
Even species that are kept as pets and in aquariums should be regulated and tracked because their accidental release can have serious negative environmental impacts. Some owners and aquarium keepers intentionally release these species into the wild rather than destroy them, and accidental release is always a risk. Therefore, if a potentially destructive species is going to be kept as a pet or in an aquarium they should be regulated so proper safety precautions can be taken.
As a vector for the introduction of nonnative species, why is hull fouling particularly difficult to combat?
Recreational boating and commercial shipping are an immense source of revenue and commerce around the world. Therefore, the need to protect the environment must be balanced against the needs of individuals and communities to earn a living. People who financially benefit from these industries do not want too many obstacles erected in the way of such businesses.
The defining characteristic of potable water is that it _______.
Which of the following is least likely to have difficulties with economic access to potable water?
The most common source of water contamination is _______.
Which of the following activities depend upon the availability of supplies of freshwater?
Explain why the amount of water a person needs to survive can be highly variable.
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