Why are earth magnets so strong?

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.

Which statement correctly describes a way that mutations increase the likelihood that a species will survive in a changing environment

The negative impacts of nonnative species generally outweigh the positive impacts