Why do you think that it is important for health care workers to have corona virus vaccine?

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

In 1992, hurricane andrew left a wake of destruction through florida. one victim of the storm was a reptile-breeding facility. over 900 burmese pythons were set free, and today thousands of pythons live in florida. these pythons are an invasive species, or a harmful species not native to the region. 1. what impacts do you think the burmese pythons might have on local ecosystems

How can you tell the difference between rough er from smooth er?