Los y las son plantas que crecen en un clima tropical. tiburones, manglares
algas, tortugas
manglares, palmeras
peces, algas

Manglares, palmeras

Explanation:

We need to complete the sentence "Los y las son plantas que crecen en un clima tropical."

Where "los" is like "the" but used only for masculine words, and "las" is similar, but only used for feminine words.

The translation of the sentence would be something like:

"the__ and the___ are plants that grow in tropical weather"

So we need plants, where the first one is masculine and the second one a feminine.

Looking at the options, we can discard 3 of them, the first, the second and fourth, because:

The first one says "tiburones, manglares", tiburon means shark, this is not a plant, so we can discard this option.

The second one says "algas, tortugas", tortuga means turtle, so we can discard this also.

The fourth one sats "peces, algas" peces means fish, so we also can discard this one.

The only option left is the third one, Manglares, palmeras, where both of them are plants. (the manglar is more like an little biome that grows around rivers)

Then, the full sentence is:

"Los manglares y las palmeras son plantas que crecen en un clima tropical".