The end of which era left many plants, insects, and salamander-like animals on the Earth? a.
the Precambrian time
c.
the Paleozoic era
b.
the Mesozoic era
d.
the Cenozoic era

Please select the best answer from the choices provided

A
B
C
D

one centimetre is equal to 0.01 metres

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.