WILL GIVE BRAINLIEST TO AN IN DEPTH ANSWER:) If all organisms start off as one cell how is it that one cell can form different specialized cells?

A multicellular organism develops from a single cell (the zygote) into a collection of many different cell types, organized into tissues and organs. ... During development, cells use both intrinsic, or inherited, information and extrinsic signals from neighbors to "decide on" their behavior and identity.

Explanation:

Cell differentiation is how generic embryonic cells become specialized cells. This occurs through a process called gene expression. Gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a cell functions

there is not 1 highest source of protein, but there are many; meats, fish, poultry, seafood, cheese, eggs, yogurt and milk. the only non complete animal food that is beneficial is gelatin.

sorry if this did not , have a great day!