Pest can cause what kind of contamination?

I don't know maybe you can browse it

pest can cause both Biological contamination and Physical Contamination.

Explanation:

Biological contamination is caused by the substance which is produced by pests that cause contamination in the food.Physical contamination in which food is contaminated physically when the pests such as rats and mice leave feces that cause contamination of food.

pests are animals or insects that cause damage to food, crops, the metabolic substances which are released by the pests cause contamination of food.

some of the common pests are rodents, insects, fungi, mites.

Some of her  assignments would be creation of drugs. she is a medical chemist after all so she'd need to have the necessary knowledge to make medicine which can later be sold in a pharmacy 

The proton has a positive charge while the neutron has no charge they both make up the nucleus of the atom while the elections have a negative charge and surround the nucleus of the atom. the protons and electrons are used to calculate the atom's mass whereas the neutrons don't affect the mass