mass energy formula labelled

h labelled

q labelled

brain cell neuron labelled

s labelled

l labelled

a labelled

i labelled

v labelled

t labelled

z labelled

y labelled

Animal Cell labelled

neuron labelled

p labelled

g labelled

c labelled

d labelled

r labelled

e labelled

w labelled

m labelled

b labelled

f labelled