well i don't know

Hi Aurora

Mass is a fixed quantity denoting the gravitational potential of a body. Weight on the other hand is a variable depending on the gravitational attraction of two bodies which each have mass. For example if you were to stand on scales on the earth and the reading was 60Kg say, and then you travelled to the moon and stood on the same scales, your measured weight would only be 10Kg because the mass, and therefore gravitational potential of the moon is only one sixth that of the earth. In the process your weight has changed but your mass has not.

Because gravity results in a mutual attraction. A human being in close proximity to the earth applies a force on the earth equal to their weight. But because the ratio of the human mass over that of the earth is virtually zero it is fair to say that the human mass has no measurable effect on the earth whatsoever.

Thanks for the information didn't thought of that.....

The mass of earth can not change by humans alone. Our mass is made up of mass that was on earth in the first place. To-be-mothers get pregnant, and eat more food from the ground, or from animals who eat from the ground, and produce a baby. This does not change the overall mass, just the placement of that mass, from the ground to the baby.

So, no matter how much mass humans, or any other living thing on the planet, gains, it will not effect the mass of the earth. The only thing that does, is asteroids and meteors, which mostly burn up into gas before they even hit the ground.