Brain break! Read the funny meme joke and answer "haha" to get free brain points, or post another joke! Funniest joke gets brainliest!

The excretory system,need answers for all: )

Ammonium perchlorate nh4clo4 is the solid rocket fuel used by the u.s. space shuttle. it reacts with itself to produce nitrogen gas n2 , chlorine gas cl2 , oxygen gas o2 , water h2o , and a great deal of energy. what mass of nitrogen gas is produced by the reaction of 2.1g of ammonium perchlorate?

Name a brittle metal , which is used to galvanize iron