How did the asteroid that smashed into Yucatan, Mexico 66 million years ago kill so many organisms (including the non-avian dinosaurs)?

Explanation:

Dinosaurs are living organisms that depends on the environment for survival. As the asteroid hits the Yucatan Peninsula area about 66 million years a couple of things can happen:

Frictional heating of the surface as the earth collided with the asteroid. This heating will cause surface temperature to rise globally and can induce the phenomenon of global warming. This can lead to release of water from reservoirs on the earth surface and hence flooding.

The impact can lead to increase in surface pressure beyond normal and that which life has adjusted to.

Debris in form of dust will be released into the atmosphere and a global air pollution will occur. Gases useful for life will be highly polluted by the vast amount of dusts and other particles discharged into the atmosphere.

i think its the first one