Assuming that the human population on Earth will peak sometime in the twenty-first century, the twenty-second century will witness a declining world population. Discuss how you imagine life in the twenty-second century will be in terms of the use of nonrenewable and renewable resources, economic and social development, and quality of life.

digestion

it excretes wastes

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.