Astudent wants to test the hypothesis that fertilizer improves the growth rate of grass seeds. to test this hypothesis, the student put the same amount of grass seed in 3 containers with the same type of soil. the student measured the growth at the end of the week. all plants received equal amounts of water and sunlight.
in the above experiment, what is the independent variable?

Fertilizer

Explanation:

The student wants to measure the affect of fertilizer on the growth rate of grass seeds.

Thus, fertilizer here is an independent variable while growth of grass seeds is a dependent variable

An independent variable is the one whose impact is studied on the dependent variable while a dependent factor is the one which is impacted by the variations in the independent variable.

All other factors such as type of soil , water and sunlight remains the same.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.

examples of nucleic acids are deoxyribonucleic acid (dna) and ribonucleic acid (rna).