Which of the following membranes would be directly involved in protecting the embryo from waste build-up? a. endoplasmic reticulum b. amnion c. allantois d. mitochondrial e. chorion

C. Allantois

Explanation:

The allantois is one of the four extraembryonic membranes that develop as an out-pocket of the yolk sac. The main function of allantois is to store the toxic waste, the nitrogenous waste and protects the embryo from the harmful effects of these waste products.

The allantois is a vascularized structure and its blood vessels become the blood vessels of the umbilical cord. Later, it becomes part of the urinary bladder.

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.

that would be called plucking : )

explanation:

''plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". as a glacier moves down a valley, friction causes the basal ice of the glacier to melt and infiltrate joints (cracks) in the bedrock."