<span>The correct answer is A. Shale.
Shale is a fined-grand classic sedimentary rock which is composed of mud.
Shale is typically exhibited varying degrees of fissility, breaking into thin layers. They are composed of the variable amount of clay quartz and mineral grains and a typical color which is grey.</span>
Answer: Las nefronas de los riñones procesan la sangre y crean orina a través de un proceso de filtración, reabsorción y secreción.
Explanation:
Reptile scales! Or, more specifically, reptiles descended from dinosaurs.
