Astudent arranged the four cards sequentially in a row on the basis of the periods when these events occurred. the card showing the earliest event was placed on the extreme left. which of these cards was placed third in the row?

If a student arranged the four cards sequentially in a row on the basis of the periods when specific events occurred specially in the early eras of civilization and then the card showing the earliest event was placed on the extreme left. The card that was placed third in the row is the picture showing a card label "First flowering plants appear on land'. 

The order of the pictures are:
1. Picture showing a card with label 'First life form appears in the sea'.
2. Picture showing a card with label 'First rocks formed on Earth'.
3. Picture showing a card with label 'First flowering plants appear on land'.
4. Picture showing a card with label 'First animal appears on land'. 

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant.