The two substances are rock (molten and solid) and metal (solid + liquid).
Layers of the earth from the outside in:
1. crust. hard rock/dirt/ground. Shell
2. mantle. melted rock and stuff. Egg white
3. core. Outer core - liquid. Inner core- solid. Nickle and iron. Yolk
For the second one it’s B or C, I dunno if phototropism is a real word cuz all the rest are vital.
There's so much confusion going on between<span> the acronyms </span>RER<span> and RQ. At the state of rest the </span>RER<span>, completely known as the </span>respiratory exchange ratio<span>, is actually the same as RQ or </span>respiratory quotient<span>. ... The RQ is a metabolic </span>exchange<span> of gas </span>ratio<span> that is equal to CO2 production over oxygen uptake </span>
Answer:
Protection from infection known as species resistance is a result of both the absence of necessary receptors and lack of suitable environment in the body.
