Question: delayed environment variable expansion is not enabled by default.
Answer: --> Delayed environment variable expansion is NOT enabled by default.

Question: then you should not re-pot the plant, as otherwise moisture accumulates in the soil and the roots begin to rot.
Answer: --> Then you should not re-pot the plant, as otherwise moisture accumulates in the soil and the roots begin to rot.

Question: figure 2.2 shows the principle layout of the cascade system.
Answer:
--> Figure 2.2 shows the principle layout of the cascade system.