<h3><u>Answer;</u></h3>
A. Gas exchanges takes place by diffusion.
B. It is an open system.
<h3><u>Explanation</u>;</h3>
- Most molluscs and arthropods have an open type of circulatory system.
- Open circulatory systems pump blood into a hemocoel with the blood diffusing back to the circulatory system between cells.
- Blood is pumped by a heart into the body cavities, where tissues are surrounded by the blood.
The reason for governments to intercede in the market is to insure there is regulation and no black market trading or selling occurring
with this, the government will create an equal opportunity for everyone to enter the market
Hope this helps
B. Effective against all pathogens