D. Because experimentation includes a control group. also, independent and dependent variables are part of an experiment they arent a type of research
Answer:
Fuel cell electric vehicles are powered by hydrogen
they only emit water vapor and warm air
Explanation:
Answer:
Taxonomy
Explanation:
Taxonomy is the science of naming, defining and classifying groups of biological organisms on the basis of shared characteristics.
The principal ranks in modern use are domain, kingdom, phylum, class, order, family, genus and specie
