Which is an innovation of gymnosperms? Gymnosperms are the first seed plants.
Gymnosperms are the first flowering plants.
Gymnosperms are the first vascular plants.
Gymnosperms are the first spore-bearing plants.

note:

Gymnosperms possess several key evolutionary innovations compared to earlier groups such as the clubmosses and ferns. They produce sperm-containing pollen, which is carried through the air by the wind to the female. This innovation has freed these plants from the need for water for sexual reproduction.

d. the weight of the book

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.