Answer:
Dmitri Mendeleev
Explanation:
Mendeleev published his periodic table of all known elements and predicted several new elements to complete the table in a Russian-language journal. Only a few months after, Meyer published a virtually identical table in a German-language journal.[45][46] Mendeleev has the distinction of accurately predicting the qualities of what he called ekasilicon, ekaaluminium and ekaboron (germanium, gallium and scandium, respectively). (wiki.com)
B. the muscular system helps in digestion and circulation
excretion, without it, body waste would build up and cause damage without ever having a way to be desposed of
