What is the activation energy of a chemical reaction?

Fossils can only be formed when? if mud, silt or tar is in the area to preserve the fossil ierosion does not occur and allows the fossil to form oxygen and microorganisms cannot decay the bones the area is dry and does not contain mud or silt

How does photosynthesis show the conservation of mass and energy?

In "the pig," what is the main effect that the piglet initially has on kibuka?