Balance the following Equations. 1. Al + O2 → Al2O3

2. HCl + Mg(OH)2 → MgCl2 + H2O

CaSO3 + AlPO4 →
Al2(SO3)3 + Ca3(PO4)2

4. C4H10 +O2 → CO2 + H2O

Which traits do human embryos have that link them to a common ancestor with fish and reptiles? a. scales and tail b. gill slits and scales c. tail and gill slits d. hair and tail

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange

Stage in which a star’s outer layers have started to cool and grow outward?