C. J. Pascoe writes that which queer theorist challenges that gender is natural by claiming that gender is performed through "a set of repeated acts within a highly rigid regulatory frame that congeal over time to produce the appearance of substance, of a natural sort of being"?

The queer theorist goes by Judith Butler.

Explanation:

Judith Butler remains one of the critical writers and influentials in the field of Queer Studies. In his book, Gender Trouble: Feminism and subversion of identity, and several of his writings, Butler challenges that gender is natural by claiming that gender is performed through a set of repeated actions within a highly rigid regulatory frame that congeal over time to produce the appearance of substance of a natural sort of being.

With this foremost interventionism, Butler lays the foundation of providing requisite perspective into gender issues, feminism, and other controversial gender specific issues - gay, homosexuality, and et al.

it takes hundreds of years to become stable.

if you have another question lmk.

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.