Identify the correct sentence among the following:

1. Changes in DNA and body design may result in difficulty in sustaining themselves in their habitat.
2. Variations occur in sexual reproduction
3. Variations occur in asexual reproduction

Variations are produced in sexual reproduction. Using the ability to reproduce, living organisms increase their population and feed on available resources in their niche. Changes in DNA and body design may result in difficulty in sustaining themselves in their habitat because the environment is not consistent.