Genetic variation can arise in a number of different ways. which of these is a way that variation can arise during meiosis a. fertilization b. genetic drift c. crossing over d. natural selection

Efficiency is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work)

Which best explains why viruses do not have special structures or enzymes that allow them to make their own food? viruses can use energy in living cells that they infect. viruses can replicate inside a host that they infect. viruses can cause contagious illnesses in host cells. viruses integrate their rna or dna into infected cells.

A(n) is a molecule influences the way that a molecule reacts.