Organisms with hard part stand a good chance of being fossilized

Select all the true statements about the cosmic microwave background radiation

How did the discovery of the rhesus factor affect society? o more patients died from having a transfusion with the wrong rhesus factor 0 new treatments during pregnancy could prevent harm to the developing child. o less donated blood could be used in the treatment of patients. the number of blood types was reduced by half

Based on the topographic map of mt. st. helens, what is the contour interval of the volcano about height is 2,950 m?