Detailed Solution:
The correct answer is “1 and 4”.
1) Radioactive pollution can lead to mutations in DNA, which can result in hereditary changes in animals.
2) It doesn't directly cause imbalances among different minerals in the soil.
3) Radioactive pollution does not directly hinder blood circulation.
4) Radioactive pollution is known to increase the risk of cancer (carcinogenesis) due to the damaging effects of radiation on cells.