The atmosphere is a mixture of several gases. Nitrogen is the most abundant gas in the atmoshere and oxygen is next to it. It is 78% in the atmosphere and 21% is oxygen. Remaining 1% is all other gases like argon, hydrogen, neon, etc...

Here it is an idiom that says The cricket match proved to be a big draw means it stands as a huge attraction.

With YouTube Analytics, you can track metrics on Playback locations. Playback locations gives you how many views your channel got and what videos they watched. 

With YouTube Analytics we can Find out who's watching, what they like to watch, and which videos could make you the most money.

The ATP is synthesized from ADP and an inorganic phosphate and involves special channel proteins that are embedded in a membrane. ATP is formed in the electron transport chain of photosynthesis and cellular respiration.

Photosynthesis only occurs in autotrophic organisms while respiration occurs in all types of organisms.

Now to find the difference in the given fractions, 1/2 - 1/8

First take the LCM of 2 & 8

LCM of 2 & 8 is 8

Then,

1/2 - 1/8

= (4 - 1)/8

= 3/8

Hence, 1/2 - 1/8 = 3/8.

Burning gasoline is the only process that involving in a chemical change in the given options. A chemical change is a change in the starting substances that are called reactants from the formed new substances that are called products. 

Demography is the scientific study of Birth and death, The well being and the Growth of population. In brief, it is the study of human populations based on their size, composition and distribution across space – and the process through which populations change.