1 Collagen is most commonly found within the body in the skin, bones and connective tissues. 2  The word collagen is derived from the Greek kolla, meaning glue.  Collagen gives the skin its strength and structure, and also plays a role in the replacement of dead skin cells.
sieve A sieve is a mesh strainer used to separate lumps and clumps from the fine material. Sieves are handy for everything from sifting flour to prospecting for gold â anything where you need to separate the big from the small. If youâre an archaeologist, you've probably used various sorts of sifters and shakers to sieve through the soil to recover even the tiniest artifacts.
A sieve can be a strainer. It usually has a handle & wire mesh. Sieving is when you pass flour & other things through the strainer to add air or get lumps out. Therefore, a sieve & strainer can be the same item but used for different purposes. Approximately. However many times a sieve is used to strain something and/or to pulverize and strain something. For instance in cooking, a sieve has many very fine and small holes.