If you look it up it will give you plenty of information. This is what I found:
The valence electrons of metals move freely in this way because metals have relatively low electronegativity, or attraction to electrons. The positive metal ions form a lattice-like structure held together by all the metallic bonds. ... When nonmetals bond together, the atoms share valence electrons and do not become ions
https://www.ck12.org/c/physical-science/metallic-bond/lesson/Metallic-Bonding-MS-PS/
Endocytosis is a type of bulk transport which involves the movement of large particles through the membrane in and out
Can cause a chemacal reaction
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Oxidation occurs at the anode, so your answer is (2) loss of electrons
A gene is the basic unit of heredity, DNA a self replicating material and chromosome a structure of nucleic acids and protein.
