Question

why spores covered by thick walls?

Answer 1

This is because spores need to withstand unfavourable conditions. When the favourable conditions arrive, they burst.So, to protect themselves thheyhave a thick wall.

Answer 2

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Why do spores have thick walls?
This is because spores need to withstand unfavourable conditions. When the favourable conditions arrive, they burst.So, to protect themselves thheyhave a thick wall.