Which is larger, the number of seconds in a day or...

...the number of hours in 10 years?

These two sets of five clues each leads to five words that only differ by one vowel (the vowel is a, e, i, o or u, but not necessarily in that order). What are the words?

Small robot.
Small part.
On the contrary.
Nocturnal mammal.
Wager.

Struck.
Heated (archaic British).
Straw dwelling.
A head warmer.
Not cold.

Due to rumours that there was a world shortage of chewing gum, everyone was stocking up on packs. By the time I'd got to the store, they had sold out!

However, there were two people at the till who had already bought 4 and 5 packs respectively and they kindly offered to share their packs with me.

After the sharing, we all had the same number of packs each and I paid them $9 for my packs. How did they share the $9 between them?

Which four vegetables have been merged together?

CAB SWE RPR EED OAA ETN