Answer:
It's a series in a list
Explanation:
The author is listing out why we remember the soldiers. Commas are used to separate these words so they are not all read at one, but they are read with a pause in between.
Completely arbitrary constructed
Answer:
More plant-eating animals would survive.
Explanation:
And the population of the herbavores would grow or other predetors would suround the area
Answer:
ate dinner
Explanation:
I is the subject, the noun, while the verb is ate dinner, the predicate.