Choose the false statement about the forces acting on a rock that is sitting on the ground. a. the rock has no weight when it is motionless. b. the heavier the rock, the greater the normal force. c. the magnitude of the gravitational force and the normal force is the same. d. the direction of the gravitational force acting on the rock is opposite to the direction of the normal force acting on the rock.

A is the false statement

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation:

b. lithosphere, asthenosphere, mesosphere   is the answer most likely