14~16周作業

3.6 what happens to matter in an ecosystem?
A:It can classified biogeochemical cycles,nurient cycles,hydrologic,water cycle,carbon cycle , nitrogen cycle and phosphorus cycle.

3.7 how do scientists study ecosystem?
A:
1.Some scientists use field reserch,laboratory reserch,and mathemtical and other models to learn about ecosystem.
2.Other scientists use models to simulate ecosystems.

4.1 what is biological evolution and how does it occur?
A:
1.Biological evolution is the scientific explanation of how the earth's life changes over time.
2.It's could say that populations evolve when genes mutate and give some individuals genetic traits tjat enhance their abilities to survive and to produce offspring with these traits.

4.2 how do geological and climate changes affect evolution?
A:They changed by tectonic plate movements,volcanic eruptions,earthquakes,and climate change that have shifted wildlife habitats,wiped out numbers of species,and created opportunities for the evolution of new species.

4.3 what is an ecological niche?
A:Ecological niche is as a result of biological evolution,each species plays a specific ecological role.