Cloud seeding
Another instance where supercooled and mixed-phase clouds are studied extensively is related to cloud seeding and weather modification. Cloud seeding involves the addition of aerosol, such as silver iodide aerosol, that modifies the phase and size distribution of hydrometeors. The goal of cloud seeding is to alter the natural development of the cloud to enhance precipitation, suppress hail, dissipate fog, or reduce lightning. Various cloud seeding techniques are employed, as particles are released from rockets, aircraft, or ground. The seeding of ice-phase clouds can induce the phase transition from a supercooled water cloud to one composed of ice. In the case of dynamic cloud seeding, the purpose is to stimulate vertical air motions through increased buoyancy caused by the release of latent heat of freezing (Hobbs, 1975; Cotton and Pielke, 1995).
The answer is B and that is the same reason that everything stays on the Earth because it has very strong gravity.
Mutation is a source but it is not the main source after it comes recombination in which 2 chromosomes with “normal” survival are taken from natural population of Drosophila and combined. Then comes immigration of genes in which the new chromosome mix in with different gene frequencies.
Antibiotics such as cycloheximide
are frequently added to sabouraud agar for isolating fungi from clinical
samples because most fungi grows and multiply slowly at least compared with
bacteria that grows rapidly after 24hours. Incorporation of antibiotics into
the agar will prevent the growth of bacteria and also other environmental
fungal such as Aspergillus spp.
A. Releasing a stimulus when hormones increase or decrease I think
