I'm not sure what the choices are, but here are some answers that are true about ecosystems:
An ecosystem is a large community of living organisms
Each ecosystem has its own community.
Once defined, an ecosystem is a unit scientists can analyze
The living parts (plants, animals and microbes) of an ecosystem are the biotic components.
The greater the inputs, the greater the biodiversity in an ecosystem.
Ecosystems are dynamic and a greater input leads to a greater biodiversity.
Not enough oxygen
rainforests will turn into desserts like the Sahara dessert which use to be a tropical place.
That would be the Gobi desert.
Answer:
Convergent boundaries are the faults where two plates converge, or collide, and can form the following;
NO) rifts form
YES) subduction occurs
YES) Island arcs form in the sea
NO) mid-ocean ridges mark locations
YES) volcanic mountains form on land