DNA replication is said to be semi-conservative because of this process of replication, where the resulting double helix is composed of both an old strand and a new strand. ... Semiconservative replication would produce two copies that each contained one of the original strands and one new strand.
SOURCE: cK12.org
Center of nucleus that stores materials for making ribosomes
Von Helomont = He told plant makes it's substance from water not form soil.
Joseph Pristley = He stated CO2 is taken & O2 released by green plants
Igenhousz = He discovered the significance of light & chlorophyll in photosynthesis