How do webbed feet ducks survive? a.) webbed ducks maintain homeostasis. b.) webbed feet ducks keep their balance on land c.) ducks are birds, and many birds have webbed feet d.) webbed feet ducks more efficiently thru water why do many desert plants have small leaves? a.) small leaves protect desert plants form pollution b.) leaves that have a small surface area lose less water c.) deserts are cold and small leaves hold in heat d.) small leaves protect desert plants from animals that eat plants how do a cat's teeth the cat catch mice? a.) cat's teeth are sharp and the cat keep a secure hold on its prey b.) cat's teeth are white and attract mice c.) cat's teeth are large and the cat catch large animals d.) cat's teeth are not visible to mice at night

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.

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.