What is electronegativity

Electronegativity, symbol χ, measures the tendency of an atom to attract a shared pair of electrons (or electron density). An atom's electronegativity is affected by both its atomic number and the distance at which its valence electrons reside from the charged nucleus. The higher the associated electronegativity, the more an atom or a substituent group attracts electrons.

organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.

the answers would be

the first one and the second one