Why is the fossil record of marine organisms MORE complete than that of organisms from terrestrial ecosystems?

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Answer: Gaps in the fossil record. Because not all animals have bodies that easily fossilize, the fossil record is considered incomplete.

Explanation:

The fossil record is in fact incomplete, preserved fossils represent a biased sample, fossil discovery is not random and those found reveal only partial information about the original organisms. Nucleic acids, for example, have a very limited survival time.

Under normal conditions of fossilization, only about 15% of organisms are probably conserved. The fossil record is influenced in favor of those animals and plants with hard, mineralized shells, skeletons or cuticles, and towards those that live in marine environments.

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Meselson and Stahl used density labeling of DNA to show that DNA replication occurs via a semiconservative mechanism. In their e

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Answer:

The organism previously used 15N for replication so all the DNA molecules were of 15N15N type. Then the organism is shifted to a medium where only 14N is available for replication.
According to semi conservative mode of replication, a newly synthesised DNA molecule consists of one new strand and one parental strand. So after the first round of replication, All the 15N strands will synthesise new DNA strands using 14N resulting into intermediate 15N14N DNA molecules. Hence, only one band would be observed (15N14N) above the original 15N15N band since 15N14N has lighter isotope too so it will be lighter than 15N15N molecules and will lie above it.
After second round of replication, 15N strand from 15N14N would synthesise another 14N strand. 14N strand from 15N14N molecules will also synthesise another 14N strand. So now, 50% of the DNA molecules will be of 15N14N intermediate type and 50% of them will be of 14N14N type.Two bands will be observed above the original 15N15N band. One band of 15N14N molecules will be right above it and other band of 14N14N molecules will be even higher because it is the lightest band since it has only the lighter isotope of nitrogen.