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I am struggling with this one!
I need help on:
CRT screen coating -8 letters. All I have is ?????H?R. I need help too on - Substance forming outer skeleton of Insects etc.6 letters and I have the last letter as N
And - I said I was struggling - there is one more
Unicellular organism such as a slime mould. 7 letters and I have P?O?I??
Is there anyone out there?

phosphor
chitin
protist?

Chrise
Thank you so much - how on earth do you know these things - I have even searched google without success?

You're welcome, jay. I have a scientific background

don't have a scientific background, but have an enquiring mind