Biological variation of species on earth, genetic variation and variation of ecosystems.
Deoxyribonucleic acid is a macromolecule which stores the cell’s genetic information and passes it on to the next generation. DNA contains the genetic code, the blueprint for protein synthesis.
A droplet infection is…
Infection through contact with pathogen-containing droplets or aerosols, spread by the infected person during speaking, coughing, or sneezing. Tiny aerosols can remain suspended for hours and represent a source of infection. Influenza and tuberculosis are transmitted this way.