The only independent variable in this experiment is the amount of nitrogen Sarah uses. All of the other variables are dependent on other factor and processes, but Sarah controls the amount of nitrogen that she uses for each plant.
(B) different constellations appearing at different times of the year
The answer is D because it dissolves a variety of substances
I’m assuming it’s talking about guanine and cytosine so the next thing would be adenine and thymine because it is talking about DNA which consists of thymine
This device is called a taxon
