What is a difference between prokaryotic and eukaryotic cells?

A.
Prokaryotic cells do not have a nucleus, but eukaryotic cells do.
B.
Prokaryotic cells always have cell walls, but eukaryotic cells do not.
C.
Eukaryotic cells do not have membrane-bound organelles, but prokaryotic cells do.
D.
Organisms with eukaryotic cells are always multicellular, but organisms with prokaryotic cells are not.
Undo

The correct answer is option (A) i. e. Prokaryotic cells do not have a nucleus in their cell but eukaryotic cells have nucleus in the cell.

Explanation:

The main difference between prokaryotic and eukaryotic cell is that prokaryotic cells have no nucleus in their cell while eukaryotic cells have nucleus present in the center of their cell. In prokaryotic cells, DNA or genetic material is present in the place of nucleus in the center of the cell.

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.

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.