Answer: Contact ; crosses
Explanation:
Exposure refers to the condition in which there is a effect of the substance on the body. Generally this term is used for the exposure to harmful substances. Exposure to harmful radiation or chemicals can be deadly for the body.
In case of dose, the mass of contaminants that crosses a tissue barrier. The amount or the quality of the substance that is given to the body is defined as dose.
The more is the quantity, more will be the dose.
