A major function of this mucus is to protect against infectious agents such as fungi, bacteria and viruses. The average human body produces about a litre of mucus per day. Bony fish, hagfish, snails, slugs, and some other invertebrates also produce external mucus.n vertebrates, mucus (/mjuËkÉs/ MYOO-kÉss; adjectival form : mucous) is a slippery secretion produced by, and covering, mucous membranes. Mucous fluid is typically produced from cells found in mucous glands.
The basic structure of an IF statement in an Excel formula is: =IF(Condition, Value if condition is true, Value if condition is false). After testing the condition, Excel returns either one of the two supplied values, based on whether the condition evaluated to true or false.ultiple IF Statements. Multiple IF statements let you evaluate a condition that has more than two possible outcomes. To create a multiple IF statement, replace the value returned if the condition is evaluated to false in the first statement by a second IF statement, enclosed in its own set of parentheses.
To use a worksheet formula to compare the data in two columns, follow these steps: 1  Start Excel. 2  In a new worksheet, enter the following data (leave column B empty): 3  Type the following formula in cell B1: =IF(ISERROR(MATCH(A1,$C$1:$C$5,0)),,A1)  Select cells B1:B5.