In which of the following periods of the mesozoic era did the first dinosaurs and flying reptiles appear?
a. triassic
b. jurassic
c. cambrian
d. cretaceous

This cartoon appeared in 1916. the topic of the cartoon isa)the reason for the start of world war i.b)the success of us submarines in world war i.c)the military alliance between germany and mexico.d)the attitude in the us towards submarine warfare in world