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+[[G11 Pre-AP Biology]]
+Species relatedness can be determined using a phylogenetic tree.
+Phylogenetic trees are formed using evidence.
+* Anatomical Evidence:
+	* Studying structure and form.
+	* Includes size shape and other physical features.
+- Physiological Evidence:
+	* Study of functions/processes, such as chemical and internal processes.
+	* Example, guinea pig's insulin is closer to humans than mice.
+- DNA Evidence:
+	- Studying DNA sequence (bases) or amino acid sequence. DNA similarity positively correlates with relation.
+
+In terms of evidence credibility for relatedness, DNA > physiological > anatomical.