Why are security experts concerned about "dirty bombs”?
they are easier to build than nuclear weapons.
they are more powerful than nuclear weapons.
they can be sent in letters through the mail.
they specifically target oil supplies.

A

They are easier to build than nuclear weapons.

Explanation:

They are easier to build than nuclear weapons.

Explanation:

Dirty bombs are explosives that spread radioactive material. There's nothing about them that makes them specific for oil supplies. They cannot be send in a letter at all and they are certainly not as powerful as an atomic bomb, which can easily destroy a big city entirely. So we only have left the first option.

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.

hr2520 is the patient's act. there is required the secretary of health to summon a committee to develop a national strategic plan of prevention. this committee has forth provisions that make possible for the govern entities to acquire private health insurance services.

is easier to keep this hr2520 as federal, because that way the secretary of health has centralized power to deal with private insurance companies and the federas government has more ways and power to negotiate with them, than doing this process state by state in their specific terms.