Which of the following processes or steps taken to produce reliable results to answer a specific question

What two fields of study provide the core information that is used to classify organisms?

In a cladogram' when does a group of organisms branch off

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons