1. heterozygous
2. fact because the color is passed down from the parents
3. This can happen because the trait is recessive and not dominate
4. A
5.A (i think)
6. traits are passed on through genes
Microorganisms such as bacteria can be removed by disinfection. Certauns substances called biocides are addes to water to make it pure. Purification can also be done by UV-light .
