Explain how the protein contained in seeds or milk is useful for the plant sprouting from seed or the baby mammal

Proteins produces tissues

Explanation:

All the living things need proteins to form and develop our tissues, in the case of the plants they have different aminoacids that conforms their proteins, the neccesay ones to develop the new tissues.

In the case of the baby mammal, their aminoacids are quite different but at the end will conforms their tissues that ara going to be different if we talk about the hair, than the skin.