What is the national firearms act?

it requires a background check for individuals wanting to purchase fully automatic weapons.

it requires national registration of all guns and gun owners.

it requires registration of fully automatic weapons and short-barrel shotguns.

it forbids concealing fully automatic weapons and short-barrel shotguns.

It requires national registration of all guns and gun owners.

Explanation:

The National Firearm Act is the act imposed in United States. It imposes an excise tax on the manufacture and transfer of firearms. It mandates the registration of the firearms. It makes the compulsory national level registration of all firearms along with the names and other details of the firearm owners. It helps in prevention of crime. As the firearm if found at the scene of crime with the registration number of the firearm can help in following the culprit.

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.