Scientists investigated what deer eat and found: - Deer can ONLY eat a native grass called Sagebrush. Sagebrush has always grown in Colorado. - Elk can eat Sagebrush AND Cheatgrass. Cheatgrass is an invasive species.

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When a virus infects a host cell, it uses the cell's machinery to make copies of its own genetic material in a process called replication. finally, during the process of self-assembly, that protein shell and the copies of the virus's genetic material are assembled into new viruses.