'Penicillin & tyrothricin are examples of this bacteria-destroying item'
an antibiotic
BIO: Penicillin & tyrothricin are examples of this bacteria-destroying item
Penicillin & tyrothricin are examples of this bacteria-destroying item
Penicillin & tyrothricin are examples of this bacteria-destroying item
"BIO"
an antibiotic
"BIO"