What is the net force on a 2-kg skateboard accelerating at a rate of 3 m/s2? A. 2 kg divide 3 m/s2 = 0.67 N
B. 2 kg - 3 m/s2 = -1 N
C. 2 kg * 3 m/s2 = 6 N
D. 2 kg + 3 m/s2 = 5 N
Please I really need help

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:

answer: the answer is b

human-caused climate hope this