Match the immune system line of defense with its correct description. includes mechanical barriers that prevent microorganisms from entering the body includes cells and processes that help remove or neutralize organisms that have penetrated mechanical barriers a complex defense that recognizes and reacts to specific organisms second line of defense arrowRight first line of defense arrowRight third line of defense arrowRight

What are your best tips for staying focused and staying on task to finish something?

In 2009, a flu pandemic was believed to have originated when viral transmission occurred from pig to human, thereby earning the designation, "swine flu." although pigs are thought to have been the breeding ground for the 2009 virus, sequences from bird, pig, and human viruses were all found within this newly identified virus. what is the most likely explanation of why this virus contained sequences from bird, pig, and human viruses? a) the virus was descended from a common ancestor of bird, pig, and human flu viruses.b) the infected individuals happened to be infected with all three virus types.c) related viruses can undergo genetic recombination if the rna genomes mix and match during viral assembly.d) the human was likely infected with various bacterial strains that contained all three rna viruses.

What’s the first step in handling stress? list eight strategies for managing stress. what are some physical symptoms of stress?