1. Which of the following is NOT an essential characteristic required of an organism to be classified in the phylum Chordata?
a. Dorsal, hollow nerve cord
b. Notochord
C. Pharyngeal pouches
d. Vertebrae

c. would be the answer : )

explanation:

the answer would be   10%

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).