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KengaRu [80]
3 years ago
5

5. When are blackheads formed?

Biology
2 answers:
den301095 [7]3 years ago
5 0
I think the answer is A
Drupady [299]3 years ago
4 0
The answer is A - it happens when the opening of the hair follicles becomes clogged with dead skin, dirt and oils. Each of these follicles contains a sebaceous gland (which produces sebum). Eventually after this opening has collected all of the dirt, oil etc it will form a blackhead.
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