What fuels we get energy from by burning them. Natural gas
Petrol
Coal
Nuclear fuel

phylogenetic tree is the tree of life or evolution tree. it shows the different branches of evolution. the sequence goes like tissues - coelom - backbone - endoskeleton - segmentation

yes? sounds right, but you didn’t ask a question.

i thinking chemical change

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.