What is this article mainly about? A. Mario Andretti and his son, Michael, were the first set of father-son opponents ever in IndyCar history. B. Mario Andretti and his twin brother Aldo were born during wartime in 1940 and lived in a part of Italy that later became part of Yugoslavia. C. Mario Andretti made millions of dollars, was placed in four Halls of Fame, and is believed by many to be the best racecar driver of all time. D. Mario Andretti has written three autobiographies and has been the subject of eight books written by other authors.

it would be kevlar ^^

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.