33. what makes cycling ideal for cross-training? (select all that apply)
d
a it's low-impact.
ob it's non-weight bearing.
oc it's high-impact.
od it's weight bearing.

Viruses ) manufacture their own atp, proteins, and nucleic acidsb) use the host cell to copy themselves and make viral proteinsc) use the host cell to copy themselves and then viruses synthesize their own proteinsd) metabolize food and produce their own atp