Modern cell theory is best described as being based on
a) simular evidence collected in multiple experiments by diffrent people
b) experiments conducted in the mid- 1600s
c) accounts of waht does and does not happen in the natural world
d) the work of robert hooke

Correct A) Similar evidence collected in multiple experiments by diffrent people

Cell theory in a biology is a scientific theory, which is universally accepted and it states that all living organism are made up of one or more cells, cell is the building block of living thing, it also states that all cell arise from ore existing cells.

The cell theory is collection of ideas and conclusion, which were given after many years of continuous research and experiment of many scientist, which tells about the cell and how it operates.

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.

oxygen +1 most likely