Prokaryotic organisms have a single origin of replication, whereas eukaryotic organisms have many origins where replication occurs simultaneously. which of the following is the most probable reason for this observation?
prokaryotes do not replicate their dna.
prokaryotic dna is single-stranded.
prokaryotic dna is much smaller than eukaryotic dna.
prokaryotic dna is replicated more slowly than eukaryotic dna.

Prokaryotic DNA is much smaller than eukaryotic DNA.

Explanation:

Origin of replication is the site on DNA where DNA replication can be started. Eukaryotes have a larger DNA than that of prokaryotes. The larger DNA size of eukaryotes poses the need of multiple origin of replications. DNA replication can begin simultaneously on these multiple origin of replication sites. This allows the larger eukaryotic DNA to get replicated quickly.

Smaller DNA of prokaryotes can be replicated with single origin of replication.

this is math not biology xd

4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."