Questions

Sparse matrix,

Index generation

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.

Groundwater is all the water that has penetrated the earth's surface and is found in one of two soil layers. The one nearest the surface is the "zone of aeration", where gaps between soil are filled with both air and water. Below this layer is the "zone of saturation", where the gaps are filled with water.

Geraldine Mock "Jerry" was the first woman to fly around the world successfully in the year 1964.

Let speed of slower train = 2x
⇒ speed of faster train = 5x
ATQ, (150 + 200)/(2x + 5x) = 15
x = 10/3
Time required=350/[50/3–20/3]= 35 seconds

Mukesh Ambani, an Indian who secured 13th position in Forbes ultra rich list 2019. 

Mukesh Dhirubhai Ambani is an Indian business magnate, the chairman, managing director, and the largest shareholder of Reliance Industries Limited, a Fortune Global 500 company and India's most valuable company by its market value.

Euglena move by a flagellum (plural ‚ flagella), which is a long whip-like structure that acts like a little motor.

The paramecium uses its cilia to sweep the food along with some water into the cell mouth after it falls into the oral groove.

The underside of the starfish is covered with hundreds of tube feet, which it uses for walking around, for attaching tightly to rocks, and for holding on to prey.

Nereis possess setae and parapodia for locomotion