Answer:
These are things that won't be going away. Natural gasses and fossil fuels will likely run out someday or become much harder to find. When you use these sources of energy, they won't be going away and therefore will be sustainable because we can always continue using them.
Does that make sense?
Explanation:
I don't none of them are
I hope this helps!
Many people feel the use of genetic engineering in food and farming is wrong, that is goes against nature and their spiritual beliefs. Hope this helps!
One the XY belong to the male (XX is for females ) and these chromosomes are sex chromosomes and are always the same in every human being ( well except for some genetic disorders)
