The sentences are:
- Hay menos ballenas que peces en el mar.
- Hay más peces que ballenas en el mar.
How to write the sentences
The task provided involved making comparisons using the phrase "menos... que" (less... than) in Spanish, regarding the entities "ballenas" (whales) and "peces" (fish) in the context of the sea ("en el mar").
The logical sentences constructed were:
a. "Menos ballenas que peces" (Less whales than fish)
b. "Más peces que ballenas" (More fish than whales)
These sentences compare the quantities of whales and fish in the sea.