An amoeba is a unicellular organism, which doesn’t have a stomach for digestion of food. How does food storage and digestion take place in an amoeba?

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.

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.