Read and choose the correct option to complete the sentence.

Los ríos son con plantas y animales.

una cascada
un ecosistema
un glaciar
una llanura

I think it is B.

B) un ecosistema

Explanation:

because a river is something that carries life , and it's called an ecosistem

I think also that is b.

a "cascada" is a waterfall

an "ecosistema" it's an ecosistem

a "glaciar" it's a glacial

a "llanura" it's an evenness.

So I think that the best option its an ecosistem, because it have plants and animals.

Explanation:

cuando era un niño durante el verano salía a jugar con mis mejores amigos, ¿verdad?