15. which of the following do scientists think is responsible for climate change?
nitrogen
smog
acid rain
carbon dioxide.
16. the goals of biodiversity conservation include all of the following except.
protecting individual species.
introducing exotic species into new environments.
preserving habitats and ecosystems.
making sure local people benefit from conservation efforts.
17. humans can cause an ecosystem to collapse by
collecting and chemically altering industrial waste to detoxify it.
reducing habitat fragmentation.
hunting a keystone species to extinction.
building shelter belts next to farm fields.

The correct answers are:

15. carbon dioxide;

It is thew gas that is the most responsible for the Greenhouse effect by managing to trap the heat in the atmosphere.

16. introducing exotic species into new environments;

The introduction of invasive species is damaging to the biodiversity as those species are often out-competing the native species and systematically destroy them.

17. hunting a keystone species to extinction;

Hunting a species to extinction is directly contributing to the destruction of the biodiversity, not in preserving it.

c. 2,000 bce

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what events in mexico's history might explain why the country continues to have difficulty improving social justice and economic opportunities for all people?