Many species—whether plants or animals—have used the oceans to move around the planet. By swimming or riding on floating objects like logs or leaves, these organisms have found new places to live. Their movement depended largely on ocean currents and winds. However, this changed when humans began to travel long distances by ship. Today, as a result, organisms can travel faster and farther around the world. An invasive, or non-native, aquatic species is any organism that exists in or near water where it does not belong. When a foreign species arrives in a new location, several things can happen: It can find its new habitat unwelcoming and die off; it can survive with little environmental impact; or it can take over, harming the native species in a number of ways. Invasive species that thrive usually do so because their new home lacks natural predators to control their population. They do damage mainly by eating native species, by competing with them for food or space, or by introducing previously-unknown diseases. One infamous example is the zebra mussel, accidentally introduced by a cargo ship from the Black Sea into the North American Great Lakes in 1988. The little shellfish multiplied quickly. Many of the Great Lakes’ original mussel populations died off because they could not compete with the zebra mussel for food sources. The zebra mussels also affected human structures by attaching themselves to anything from factory intake pipes to ship rudders. They have now spread from Canada to Mexico and are considered a major problem. Hundreds of millions of dollars are spent every year to try to control them. To combat invasive species, governments are mostly focusing on how to handle ship ballast. This is seawater that ships carry in a tank to provide balance on journeys. On arrival, the water—along with whatever species happen to be in it—is released. New regulations in some countries require ships either to exchange their ballast before they enter a freshwater port, or to treat it with chemicals to kill invasive species before release. 1. What point does the writer make in the first paragraph? Select one: a. Developments in transportation have affected the global spread of species. b. Humans and other species have influenced the weather and ocean currents. c. Logs and leaves are easily capable of traveling from one ocean to another. Clear my choice
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what point does the writer make in the first paragraph?
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