From the 1900's to 2000's mainly, 1997
Answer:
Hybrid Offspring Degeneration Phenomenon...
Explanation:
This happens in hybrids because of their improper alignment of chromosomes. It is rare but when two hybrids mate, they already have defected copies of chromosomes of their parental specie. That why the offspring from hybrids are mostly born dead and degenerate totally in embryonic stage.
Usually DNA is double stranded, RNA is single stranded. all nucleotide types are same except DNA doesn't have uracil and RNA doesn't have thymine.
Carbon atoms have more mass than other atoms. They have 6 protons and 6 neutrons plus 6 electrons!