Robert hooks discovery scientists learn more about

Cell

Explanation:

Robert Hook is considered to be a pioneers in the field of Micro and cell biology. He was the person who discovered miscroscope that was a source of helping in discovery of several future breakthrough researches in the field of cell biology. During his experiment that lead to the invention of microscope, Hook carefully controlled the height and angle of the microscope by giving it the right illumination sources. He first of all examined the bark of trees where he could see small structures which he named as cell. In subsequent years after the discovery of microscope, scientists were able to learn more about cell and even subcellular organelles with their functions.

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sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.

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.