Semiconservative replication was not the only model of DNA replication proposed during the mid-1950s, however. In fact, two other prominent hypotheses were put also forth: conservative replication and dispersive replication.
Main idea. Aquatic ecosystems are grouped based on abiotic factors such as water flow, depth,distance from shore, salinity, and latitude. Freshwater ecosystems. The major freshwater ecosystems include ponds, lakes, streams,rivers, and wetlands.
Abiotic factors are the non-living factors in an ecosystem that  effect the survival of organisms in the ecosystem. Light,  temperature, and atmospheric gases are the exampl â¦ es of Abiotic  factors. Another example would be a forest fire.