The X can possibly be the sex chromosome. Like for human female we have the XX chromosomes and when the allele is on the X chromosome we write as X with a R as the superscript on top right.
The difference between plant and animals is that plants take carbon dioxide while animals breathe in that oxygen and breathe back out carbon dioxide
All life as we know it is carbon-based, so what scientists could determine is that there is no carbon-based life at the origin of the meteorite. However, this does not necessarily mean that there is no life there; our knowledge is only based on our experiences of life on Earth, so it is possible that life has developed in other regions of space upon other elements and formations. For example, there could be life based on silicon or other chemical compositions.
The formation oil, that is, sweet crude, is typically that accumulate on the seafloor and "kitchen" of the geothermal gradient to be altered in petroleum products.while <span>Most of the </span>coal<span> we use now was </span>formed<span> about 300 million years ago, when much of the </span>earth<span> was covered by steamy swamps.
hope that helped</span>
