A runner completes one lap around a 400m circular track in 80s what was their speed

preservation because he preserves part of the land and preserves means save

explanation:

not always but somethings can be reproduced in a laboratory.

answer;

-chlorine

explanation;

-toxic industrial chemicals are industrial chemicals that are manufactured, stored, transported, and used throughout the world. toxic industrial chemicals can be in the gas, liquid, or solid state.

-they can be chemical hazards (e.g., carcinogens, reproductive hazards, corrosives, or agents that affect the lungs or blood) or physical hazards (e.g., flammable, combustible, explosive, or reactive).