One reason why it's important to collect evidence from many fields is that the methodology of each field can introduce a bias through its measurement methods.
For example, imagine that we find out that our method of sequencing DNA is proven to be wrong - if we collect information from many different fields, then this will not invalidate the evolutionary theory, as evidence from other fields still supports it.
In prophase, DNA begins to cluster. In metaphase, two identical, condensed DNA strands line themselves up in the middle of the cell. After metaphase, there are: Anaphase, Telophase, and Cytokinesis. This process excluding or including Cytokinesis is called mitosis.
In the DNA replication for a cell baby, meiosis occurs.
CDNA does not have introns and therefore can be expressed in prokaryotic cells. cDNA libraries are most useful in reverse genetics where the additional genomic information is less use. Also, it is useful for subsequently isolating the gene that codes for that mRNA.
If the tank is a small one and filled with freshwater, an activity performed by a student that is investigating an abiotic factor using the setup would be to record the temperature of the water.