Viruses cause contamination spreading what?
alleles Toxicity Pollution food diseases cells pores microbes
A B C D E F G H
Bacterial contamination can spread diseases to humans and livestock.
Viruses cause contamination spreading diseases 
Viruses cause contamination spreading what? (A) alleles (B) Toxicity (C) Pollution (D) food (E) diseases (F) cells (G) pores (H) microbes