Scientific investigations must be well to be sure the data collected will help answer the scientist's question.

c. establishing proper sleep hygiene

i think it is d. objects resist changes in their state of motion.

answercells,tissues,organs,organ,system-organism;

levels of biological organization; organism,population,community,ecosystem,biome,biosphere,

hope this .good luck

label a:   the core

label b : the chromosphere

label c : the photosphere

label d: the corona