Living tissue is made up of cells. There are many different types of cells, but all have the same basic structure. Tissues are layers of similar cells that perform a specific function. The different kinds of tissues group together to form organs.
A group of similar (accoding to function) types of cells, when comes together to perform a specific function, then it forms a tissues. When a group of similarly working tissues come together then they form an organ.
And this relation could be written as
cell > tissue > organ
So, organ is a collection of tissues and tissues are collection of cells.
In b you'll be mixing and heating up the sauce creating a new compound from older components and in c, the ultraviolet lights will change your skin cells.
