Compared to the Jovian planets in our solar system, the terrestrial planets have A) less mass and are less dense
B) less mass and are more dense
C) more mass and are less dense
D) more mass and are less dense

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

i'm guessing this is from edg enuity so the answers would be, from top to bottom,

theodor schwann

matthias schleiden

robert hooke

rudolph virchow

anton van leeuwenhoek