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 include water, sunlight, oxygen, soil and temperature. Water (H2O) is a very important abiotic factor â it is often said that âwater is life.â All living organisms need water. Plants must have water to grow. Even plants that live in the desert need a little bit of water to grow.