All types of scientific investigations include making

All types of scientific investigations include making hypothesis.

Explanation:

Scientific investigations refer to science research and consequential formulation of hypothesis based on pieces of evidence. These pieces of evidence are later analysed and carefully examined to support the hypothesis.

Hypothesis in itself means an assumption or an explanation that is proposed at the starting of an experiment. The crux of the scientific investigation is validating the hypothesis based on hard proofs. Besides hypothesis making, there are parts of scientific investigation which includes observation, analysis, measurement and experimentation.

answer: that would be cheating

explanation:

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.