The sensitivity of exfoliated graphene to NH3 and NO2 and that of ... the number of free electrons at EG surface, while the converse is true for NH3 as it donates ... concentration at the surface is higher than in the case of N2 atmosphere. ... and organic compounds are the most important ones amongst the polluting
Chemical bond is the right awnser
During prophase 1, Chromosomes become visible and crossing-over start occurring. Another thing that happens is the disappearance of the nucleolus and the disappearance of the nuclear envelope. The meiotic spindle then forms.
“During metaphase 1, the pairs of chromosomes (bivalents) become arranged on the metaphase plate and are attached to the now fully formed meiotic spindle. The centrioles are at opposite poles of the cell.”
I hope this helps