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Explain why weight-bearing activities build better bones. (Site 1)

Viruses use the host's machinery to make copies of themselves. however, some human viruses require a type of replication that humans do not normally have. for example, humans normally do not have the ability to convert rna into dna. how can these types of viruses infect humans, when human cells cannot perform a particular role that the virus requires? a) the virus causes mutations in the human cells, resulting in the formation of new enzymes that are capable of performing these roles.b) the viral genome codes for specialized enzymes not in the host.c) the virus infects only those cells and species that can perform all the replication roles necessary.d) viruses can stay in a quiescent state until the host cell evolves this ability.

Which effect is most likely to result from parents who do not set appropriate limits or boundaries on children? more stability less depression more teamwork less self-control

Which of the following activities can someone who is grieving? walking in the woods reading a book watching a movie cooking a meal