Answer:
Cretaceous Period
Explanation:
Dinosaurs went extinct about 65 million years ago (at the end of the Cretaceous Period), after living on Earth for about 165 million years.
Answer:
Explanation:
Total mole of gases = 7.8 + 2.1 + .09 + .01 = 10
the partial pressures of the gases in a mixture
= mole fraction x Total pressure
mole fraction = mole of a gas in the mixture / total mole
partial pressure of Ng = 
= 79.014 kPa
partial pressure of O = 
= 21.273 kPa .
partial pressure of Ar = 
= .9117 kPa .
partial pressure of Co = 
= .1013 k Pa .
Answer:
"True"
Explanation:
Breathing released by humans is naturally acidic. When humans inhale, there are also dangerous toxic substances such as carbon dioxide in the lungs inside the human body, which are neutralized with the help of HCl hydrochloric acid, but due to hydrochloric acid, the breath that man leaves becomes acidic.
The answer is geothermal.
Geo (earth) and thermal (heat).
Answer: Ionic or electrovalent bond