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.
The abiotic factors of an estuary are water depth, salinity, nutrients, air and water temperature, pH of the water, dissolved oxygen, and turbidity or cloudiness. Nutrients are substances in the water, such as nitrogen and phosphorous, available to organisms as food. Full Answer >.