27 Wednesday Jan 2021 Original size at 1600 × 1200 ≈ Leave a comment -What is the immune system? -It’s the body’s defense against -disease causing organisms, -malfunctioning cells -and foreign particles.-How do you know if yours is strong? Like this:Like Loading... Share this:Click to share on Facebook (Opens in new window)Click to share on Pinterest (Opens in new window)Click to email a link to a friend (Opens in new window)Like this:Like Loading...