The Mass is the fixed value. It doesn’t change by changing its shape ?

The center of mass doesn't move from one part of the raft to the other, but the raft moves from one side of the center of mass to the other. The raft is not fixed, from the perspective of the lake. As the boy's feet push himself forward, they also push the raft backward.

Explanation:

i take the test and it's correct

i can't see the full page, therefore, can't answer it

explanation:

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation: