The first one is A. But I can't see the rest for the next question.
Exosphere is the lowest because the higher you go the lower the air pressure the lower you go the higher the air pressure. ;) :)
Answer:
i would say d but am not there yet i got bio in 8th
Answer:
The correct answer is ''can change over time in response to environmental cues, allowing genes to be turned on or off as needed.''
Explanation:
Histones are a family of proteins involved in compacting DNA into structural units called nucleosomes. Histone modifications occur in response to environmental conditions, and modulate the structure of chromatin, that is, they alter the structure of nucleosomes and therefore chromatin, and thus activate the transcription process, in which the chromatin is in the euchromatin state (loose conformation, in which the DNA information can be read), or "off" state, in which the chromatin adopts the heterochromatin conformation (compact conformation, which prevents reading), respectively. These post-translational modifications are mainly acetylation, methylation, phosphorylation, although there are many others. These make up the “histone code” that can change the expression pattern of some genes by modifying the chromatin structure, activating or silencing these genes.
Answer: Viruses are always going to be around. They affect living creatures on this plant. Virus particles even outnumber cells by an order of magnitude in the ocean. Viruses carry many more uncharacterized genes than cellular life forms.
