Which of the following is a benefit of genetic engineering? 1.Recombinant DNA can create gene combinations never seen in nature.
2.Genetic abnormalities can be used for job discrimination.
3.Genetically engineered organisms are often sterile.
4.Genetically engineered proteins can help fight disease.

they are all solids.

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.