The circulatory aids with the immune system because they provide white-blood cells to help fight with the diseases or sicknesses.
Maybe biosphere and geosphere?
They use cognitive biases like framing, loss aversion, status quo etc. to elicit an emotional response in hopes of you making impulsive purchases.
You can use skepticism by listening more carefully to what is being said and looking up any claims made by the advertiser. Like if they say they are the cheapest car insurance, you don't just believe them you compare prices.
It's actually A. Vertebrate have a hard out shell.
