Question

question 7
ecosystem services _______.
contribute to keeping ecosystems productive
are not necessary to sustainable systems
are valuable to natural systems but not to human - created systems
are economically valuable services provided by natural systems
are required to rebalance natural systems that we have disturbed

Explanation:

Ecosystem services are processes by which natural - ecosystems and their species help sustain human life and natural systems. They contribute to ecosystem productivity, such as through pollination and nutrient cycling. They are necessary for sustainable systems and are valuable to both natural and human - created systems. While they can help rebalance disturbed systems, their main role is maintaining productivity.

Answer:

A. contribute to keeping ecosystems productive