A. true b. false: chemicals that become contaminated, dry out, or oxidize can turn unstable and become potentially explosive chemicals (pec)

The given statement is True.

The chemicals that are contaminated, dry out, and turn unstable and can become potentially explosive chemicals when exposed to certain conditions like high pressure, fire, et cetera.

There are direct explosive chemicals such as bullets ,blasting caps. Potentially explosive chemicals can get oxidized, polymerized, or become contaminated and as a result of this become explosive when subjected to heat, light. friction,et cetera.

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