Answer:
C
Explanation:
He is doing the same exact experiment, and is not changing anything. This is a replication of an experiment.
Answer:
The population is defined as the group of organisms of the same species that live in the same area. Organism – An organism is a single individual plant, animal or other living thing. 10.
The period during which the presence of stromatolites decline is the Proterzoic period. Stromatolites are widely distributed sedimentary structures consisting of laminated carbonate or silicate rocks, produced over geologic time by the trapping, binding, or the precipitating of sediment by groups of microorganisms, primarily cyanobacteria.
