Question

energy and matter are exchanged with their surroundings open system biosphere hydrosphere closed system the carrying capacity of an ecosystem is the natural resources available at one time in an ecosystem. the largest population that an ecosystem can support at one time. the number of organisms that are active in an ecosystem. the time it takes to complete a cycle in the ecosystem. earthquakes and volcanoes. * astronomy meteorology geology oceanography

Explanation:

1. In an open - system, energy and matter are exchanged with the surroundings. A closed - system exchanges only energy, not matter. The biosphere is the global sum of all ecosystems, and the hydrosphere is all the water on Earth.
2. The carrying capacity of an ecosystem is defined as the largest population that an ecosystem can support at one time. It is related to the availability of resources but is specifically about population size.
3. Earthquakes and volcanoes are geological phenomena. Astronomy deals with celestial objects, meteorology with the atmosphere and weather, and oceanography with the oceans.

Answer:

1. A. open system
2. B. The largest population that an ecosystem can support at one time.
3. C. geology