Answer: Non-homologous chromosomes
Explanation:
The overall length of the chromosomes and the placement of centromere are the two factors that required to same within the two pairs of chromosomes these chromosomes are considered as homologous chromosomes.
The non-homologous chromosomes can be defined as chromosomes that do not have the same overall length and placement of centromere is also not same. These chromosomes do not belong to the same pair or do not appear in the same pair.
The time of replication and banding pattern varies considerably in the non-homologous chromosomes.
An hypothesis is a possible explanation for a set of observations or answer to a scientific question. A supposition or proposed explanation made on the
basis of limited evidence as a starting point for further
investigation.
And practically, an hypothesis is used as the basis for further experiments, where the hypothesis is rigorously tested under varying conditions. The hypothesis that is tested and modified under different conditions may become a general
theory
.The hypothesis that has the least number of variables sufficient to explain the phenomenon is preferred.
Experiment one, because she repeated the experiment several times.
Precipitation, because when water evaporates it then condenses into clouds and releases precipitation(Liquid water) back into the cycle to balance it.