The aortic valve, which is located between the left ventricle and the aorta, functions to (1 point)
push blood forward toward the lungs.
add oxygen to blood.
filter the blood.
prevent blood from flowing backward.

23. the structures that contain membranes across which oxygen and carbon dioxide diffuse are the (1 point)
bronchi.
bronchioles.
vocal cords.
alveoli.

The aortic valve, which is located between the left ventricle and the aorta, functions to  ' prevent blood from flowing backward'.

The structures that contain membranes across which oxygen and carbon dioxide diffuse are the 'alveoli'.

the answers are as following:

1. c. double helix, nucleosome, coil, supercoil, chromosome

2. b. g2 phase, preparation for mitosis

3. d. interphase consists of the g1, s, and g2 phases

4. c. metaphase

5. a. chromosomes are duplicated before cell division so that each new daughter cell has a complete set

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).