Answer:
Workers worked longer hours.
Explanation:
The build up of lactic acid will need oxygen to break it up. Lactic acid is why muscles feel tired after excess exercise
Speciation is the
process by which new and distinct species are formed. One of the most important
factors necessary for speciation to occur is the genetic isolation of two
populations. This genetic isolation can, over long periods of time, cause these
two groups to become genetically incompatible. Factors that can lead to this
genetic isolation include geographic separation and hostility among population
groups.
