Because only the chromosomes can be seen in a karyotype, and microdeletions or insertions are mutations at the molecular level, it is virtually impossible to detect such mutations at the chromosomal level.
Regulation of a system by the output.
Many reasons including that burning of them (including use in cars) creates greenhouse gases which lead to climate change. There are alternatives becoming available that lower the greenhouse gas emissions...healthier planet!
The Celsius scale. Americans use the other one.
A photograph of all the stained, prepared chromosomes in a eukaryotic cell is referred to as a karyotype
