Which of the following is an example of chemical control of nonnative species? a. mowing b. herbicides c. net barriers d. inspections What factor determines when a species is considered invasive?
a. It has positive environmental impacts.
b. It is environmentally damaging.
c. It spreads outside its native range.
d. It spreads within its natural range.
Which of the following is not true about nonnative species? a. They can have positive impacts on an ecosystem. b. They can have negative impacts on an ecosystem. c. They can be introduced within their natural range. d. A nonnative species can be an invasive species.
Nonnative species disrupt ecosystems by _______.a. increasing biodiversity
b. preventing the spread of disease
c. disrupting food chains
d. increasing the populations of native species
introducing invasive species to an ecosystem results in an increase in biodiversity. True or False
nonnative species are only introduced unintentionally. True or False
why has the spread of the herbicide-resistant hydrilla through Florida's waterways resulted in them no longer being navigable by most boats
a.The hydrilla has induced a drought that drained the waterways.
b.The weed clogs propellers that boats use for propulsion.
c.The sticky leaves of the weed hold boats in place.
d.All of the above
Why are cane toads in Australia considered an invasive species rather than simply nonnative?
A. They are destructive to native species and have no natural predators.
B. They reproduce more quickly than native species.
C. They have venom glands.
D. Large adult specimens are able to hunt snakes.