Answer:
I think the answer would be lichens, because lichens are formed during primary succession as a pioneer species. During secondary succession, grasses are usually the pioneer species.
I need more points. That's why I am awnsering this, sorry.
Answer:
una propiedad que varía y la otra que permanece constante cuando la onda pasa de un medio a otro. Las dos propiedades son: i) Longitud de onda ii) Frecuencia
Explanation:
Hope it helps :)
I am not sure but I am guessing carbon and nitrogen :)
