What is the name of the structure labeled b & c

Which are observations about the tree on the right ,? check all that apply

The activity of the modern sample is 1.10 bq . how long does that measurement take?

Which of these is not an example of molecular homology? 1. use of dna and rna as genetic material 2.use of glycolysis as the first step in cellular respiration in both plants and animals 3. the lack of an igf-1 gene in prokaryotes 4. the use of aldolase b to break down fructose in bacteria, plants and animals