_- a threshold of resources and a maximum number of species that can survive in an environment. - more than the carrying capacity

b. read the phase at the intersection of any given temperature and pressure.

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.