which state of matter has a defined shape and volume? *

solid
liquid
gas
plasma

Not a 100% sure but i say a solid

Gases and plasmas have neither definite shapes nor definite volumes. They both expand to fill available space, and can be reshaped by their containers. Liquids have definite volume, while solids have both definite shape and definite volume.

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

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.