<span>The answer to the question of "what kind of relationship would a hummingbird an a daffodil have?" is that they have a mutually beneficial relationship, also called a mutualistic relationship - the hummingbird gets food from the flower and the flower can "use" the bird for polination, so they both benefit from each other's behaviour</span>
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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.
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The answer is “it is the gap between neurons” and “it ensures that information travels in one direction only.”
