In ecological succession, what would most likely come first when forming an established ecosystem large herbivores or higher order carnivores ?

The soviet union beat the us to the first successful launch, with the october 4, 1957, orbiting of sputnik 1, and later beat the us to have the first human in earth orbit, yuri gagarin, on april 12, 1961. the "race" peaked with the july 20, 1969, us landing of the first humans on the moon with apollo 11

Any choices for your quastion ?

There are seven crystal systems triclinic, monoclinic, orthorhombic, tetragonal, trigonal, hexagonal and cubic.