It basically allows them to see what time period it is from or from where it is from (they predict from the age). It also allows them to arrange geological events more accurately depending on where the rock was found.
The reactants of cellular respiration are the products of photosynthesis and vice versa (the products of cellular respiration are the reactants of photosynthesis). Basically, their equations are flipped.
Ok, I'm not 100% sure this is correct, given the context of the situation, but basically, the cell membrane helps the cell maintain homeostasis by keeping what needs to be in in & what needs to be out out. If it weren't for the cell membrane having the structure it does, all kinds of things could get into the cell & completely kill it from filling it with too much stuff, or the wrong things could get in (say, things with a really odd pH) & damage it badly. Or, it could let things get out extremely easily, such as enzymes and ions the cell needs to function properly.
Hope this helps!
Kingdom Protists is the kingdom that is composed if eukaryotes which are mostly unicellular and that can be heterotrophic and or autotrophic.
