In the lower passages, particles end up in the bronchial region by way of ........ as particles lose their buoyancy.

Internal combustion engines in vehicles produce exhaust emissions that result in environmental ...........

Switching to an all-electric engine vehicle that is powered by renewable resources obviates the need for fossil fuels and a ......... fuel-related products and processes that tax the environment

The most common internal combustion engine in automobile is the four-stroke engine, which completes a four-part cycle of intake, ........, combustion, and exhaust.

The ........ engine does not run at all in such circumstances.

This is an especially ....... problem in developing nations because of the prevalence of older, poorly maintained vehicles.

................. in vehicles consume petroleum and other liquids such as gasoline.

explorers ... deep into unknown regions.

blood tests were normal with the exception of a slightly raised erythrocyte .... rate

a soft, gray-white material that does not burn and was used in buildings as a protection against fire, and as a form of insulation

the Covid-19 pandemic is causing serious ......... on human life

scientists are .... finding the solutions for climate change

... study water, soil and air pollution problem and develop technical solution to solve.

A car that combines the engine of a conventional vehicle with the battery and electric motor of an electric vehicle, allowing it to achieve twice the fuel economy of a conventional car

pregnant women should reduce their ... of caffeine