Mutations cause changes in the genetic code that lead to genetic variation and the potential to develop disease. Gene mutations can be generally categorized into two types: point mutations and base-pair insertions or deletions. Point mutations are the most common type of gene mutation.
OVERNIGHTS: The Difference Between Night and Day. By. Isabelle Fox, Ph. D. Daytime gives us sunlight Nighttime brings on darkness. Daytime is familiar Nighttime is strange. Day time is for activity Nighttime is for comforting. Daytime is for learning Nighttime is for dreaming.
Planetary Days and Hours. A day is a period of time that has existed based on the most obvious natural clock we have: the Sun. For most places on the Earth, a day is the amount of time that elapses between when the Sun is at one point at the sky (say, the zenith) and the next time the Sun is at that point.