When a photon of light energy reaches a reaction center chlorophyll molecule, what becomes excited?

a) an atom of oxygen

b) a molecule of water vapor

c) an electron

d) a carbon dioxide molecule

The correct answer to this question is C

Explanation:

The photon causes the electron in the chlorophyll to become "excited". The energy given travels from one pigment molecule to The other until it reaches a pair of chlorophyll molecules called the reaction center

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.