The items that involve the study of biology are:
1 - the study of all living things
2 - the study of diseases caused by viruses
3 - the study of the molecules of life
4 - the study of species and their changes over time
5 - the study of plants
6 - the study of interactions of living things
Items 7 (the soil and Earth's surface) and 8 (the study of helium atom interactions) do not involve the study of biology.