Darwin hypothesized that new species could appear gradually through small changes in an ancestral species. What experiment did he conduct to test this hypothesis?
the breeding of finches
the breeding of pigeons
the observation of humans
the observation of dog breeds

frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.

the contamination

we are putting to many trash.

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.