predator-prey population cycles less biomass at higher levels of the food web a shrinking variety of animal and plant species competition among some consumer populations
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of these is a threat to the survival of an ecosystem?
Possibilities:
- predator-prey population cycles
- less biomass at higher levels of the food web
- a shrinking variety of animal and plant species
- competition among some consumer populations

a shrinking variety of animal and plant species