Maintaining a rich variety of genetic material that may lead to discoveries useful to humans can be ensured by 1.preserving biodiversity
2.increasing cloning
3.asexual reproduction
4.selective breeding

The answer would be 1. Preserving biodiversity

Explanation:

Since you said "Maintaining a rich variety of genetic material..." then the three other responses wouldn't make sense because they all would have identical or similar genetics.

humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.

false because ozone (o3) depletion does not cause global warming, but both of these environmental problems have a common cause: human activities that release pollutants into the atmosphere altering it.

global warming is caused primarily by putting too much carbon dioxide into the atmosphere when coal, oil, and natural gas are burned to generate electricity or to run our cars.

explanation: