Vital body systems begin to lose function as you age. aging effects all of the body's cells, tissues, and organs which in turn affect the functioning of all body systems. among other changes caused by cell aging, there is an increase in pigments and a) fatty substances called lipids inside the cell b) fatty substances called proteins inside the cell c) fatty substances called amino acids inside the cell d) fatty substances called carbohydrates inside the cell

The musculo-skeletal system serves as a means of structure and movement for the body. It holds things in place, and lets us move. Musculo (muscles) Skeletal (bones) Musculoskeletal = muscle and bone system. Basically everything that isn't an organ or nerve.

the answer is b

explanation:

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands