In order for speciation to occur , what is needed

Suppose a suitcase has a mass of (m) 30 kg and a net force (n) of 10 kg*m/s. what is the acceleration rate of the suitcasein m/s? show your work to support your answer

Genetic disorders can result when sister chromatids fail to seperate properly. during what phase is this problem most likely to occur?

9. the history of life on earth is recorded in