Answer:
a.c.n.e (join the letters together without full stops. i need to type like this as brainly does not allow me to type that word)
Explanation:
An excess of sebum combined with dead skin cells can block pores and cause blemishes such as blackheads and pimples.
It has one less electrons then protons
dioscorea alata is specific name of yam
The areas that have had the action potential are refractory to a new action potential.
Hope this helps<3
