Scientists identify hazards and assess exposure in the process of . a.
toxicity studies
b.
risk assessment
c.
risk characterization
d.
toxic assessment
e.
toxic dosage

b. risk assessment

Explanation:

risk assessment is the "process of gathering data and making assumptions to estimate short- and long-term harmful effects on human health or the environment from exposure to hazards associated with the use of a particular product or technology."

source: https://quizlet.com/2545977/aae-apes-unit-5-chapter-17-flash-cards/#:~:text=(risk%20communication).-,risk%20assessment,See%20risk%2Dbenefit%20analysis.

what's the rest of the question

i think the answer is a.keratin is the pigment responsible for skin color.