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.

The correct answer is A. They are destructive to native species and have no natural predators

Explanation:

In ecosystems, a species is considered as invasive when the species is non-native and represents a threat to other organisms and for the natural balance in an ecosystem. In the case of Cane toads, this species of toads are native to America. But was introduced in several islands of the Caribbean and the Pacific including Australia because it was used to control pests in sugarcane crops (hence its name). However, it has become an invasive species because it has led to the decrease in the population of some native species, also this species population has grown with no control because they do not have direct predators. This means cane toads are invasive species because "They are destructive to native species and have no natural predators".

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.