Tracheids possessing ladder-like wall thickenings are called

Options :
  1. annular
  2. spiral
  3. reticulate
  4. scalariform
Answer and Explanation :-

Answer: Option 4

Explanation:

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I believe the simplest explanation is, there is no God. No one created the universe and no one directs our fate. This leads me to a profound realization that there probably is no heaven and no afterlife either. We have this one life to appreciate the grand design of the universe and for that, I am extremely grateful.
-Stephen Hawking