It contains hydrochloric acid, muscular and glandular tissue to produce the enzyme protease (for proteins)
Primary succession occurs<span> in essentially lifeless areas—regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. Secondary </span>succession occurs<span> in areas where a community that previously existed </span>
Answer:
The main reason is growth factor ligands do not bind as efficiently to receptors.
Initially, normal cells work efficiently on binding of enzymes, growth factors or ligands and cellular growth cycle runs effectively but with the passage of time, cellular aging or organismal aging can lead to decrease efficiency of cellular recepotors binding with the growth factor ligands gradually.
The answer is B (example: color blindness)
