Proteins make up your hair. It is a source of nutrition. They can be used as a ligand in cell communication.
If its outermost electron shell is filled.
I use save my exams
https://www.savemyexams.co.uk/gcse-biology-aqa-new/
And I also use past AQA papers but end of topic tests
Hope it helps :)
Answer:
the tendency toward a relatively stable equilibrium between interdependent elements, especially as maintained by physiological processes.
Explanation:
Answer:
False, I got it right on my test