What statement best describes an independent variable?
a. the factor that's changed by the experimenter and impacts the constant in an experiment
b. the factor that doesn't change, but impacts the constant in an experiment
c. the factor that isn't changed by the experimenter and is impacted by the dependent variable
d. the factor that's changed by the experimenter and impacts the dependent variable

D. The factor that's changed by the experimenter and impacts the dependent variable

I learned this in Science Class

It's part of the Scientific Method

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:

earthquakes in florida are rare because the state is not located near any tectonic plates. in fact, florida is tied for first place as having the fewest earthquakes of any state. much of florida is limestone and seafloor materials that is not conducive to earthquakes.

explanation: