DNA is used in forensic science to identify criminals. It can match DNA from a crime scene to a suspect's DNA. DNA has also helped solve cold cases. Population evolution and microbial life influence antibiotic resistance in bacteria. Microbes evolve and some become resistant to certain drugs. Different species of microbes have evolved in different environments. Biological diversity evolution is seen in the adaptations of species over generations. Some grow thicker fur or camouflage to survive. Plant and animal evolution led to new species adapting to their habitats. Over time, giraffes grew longer necks and polar bears grew thicker fur. Population growth impacts the environment through increased resource use. As human numbers rise, more land is used for housing and farming.