The Enhanced Fujita scale is based on: Group of answer choices the frequency of lightning strikes concurrent with the tornado. the pressure gradient across the diameter of a tornado. the measured wind speeds inside a tornado. the level of damage caused by a tornado.

the level of damage caused by a tornado.

Explanation:

The Enhanced Fujita scale started being in use on February 1, 2007, after replacing the decommissioned Fujita scale introduced  by Ted Fujita in 1971.

This scale is typically based on the damages resulting from tornadoes  on structures and vegetation by an  estimation of the  tornado's  wind speeds.

Usually after a  tornado occurs, its related damage is analysed and rated from EF0 to EF5 according to its degree of damages by comparing to a compiled list of damage indicators, This gives an estimate of the  range of wind speeds the tornado must have produced.

d. new methods of assembly are introduced.

explanation:

this allows for the goods to be made on a larger scale. not faster because now it is shown to be made better, hence the greater productivity in the question. it is calling for something new to be introduced.