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

B. Prokaryotic cells do not have a nucleus, but eukaryotic cells do.

Explanation:

in the cells of bacteria , cyanobacteria and mycoplasma,no nucleus is seen. these organisms are called prokaryotes .

but in the cells of amoeba ,animals and plants a well defined nucleus covered by membrane is seen. these organisms are called eukaryotes

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lunar landing mission. apollo 11 was the first manned mission to land on the moon. the first steps by humans on another planetary body were taken by neil armstrong and buzz aldrin on july 20, 1969. the astronauts also returned to earth the first samples from another planetary body.

explanation: