Answer: Adaptation
species adapt to their environment
<span>An environmental factor that causes a population to decrease is death</span>
يعينك على خير ان شاءالله يارب وياك يارب وياك يارب وياك يارب وياك يارب وياك يارب وياك يارب وياك يارب وياك يارب وياك يارب وياك يارب وياك يارب وياك يارب وياك
Answer: Promoter
Explanation:
Transcription is the first step in gene expression which consists of copying the DNA sequence of a gene to produce a RNA molecule. There are enzymes called <u>RNA polymerases which perform this process of transcription</u>. These enzymes bind nucleotides (the monomers which are part of the nucleic acids) to create a RNA strand using a DNA strand as a mold.
A promoter is a region of DNA that controls the initiation of transcription of a given portion of DNA to RNA. Therefore they promote the transcription of a gene. <u>The promoter region is composed of a specific sequence of DNA located just where the starting point of the DNA transcription is</u> and contains the information needed to activate or deactivate the gene it regulates. <u>The promoter has a binding site for the RNA polymerase enzyme </u>in charge of mRNA synthesis and when it recognizes this site, transcription begins.
The speed of sound<span> is greater in hot </span>air<span> than it is in </span>cold air<span>. This is because the molecules of </span>air<span> are moving faster and the vibrations of the </span>sound<span> wave can therefore be transmitted faster. This means that when </span>sound travels<span> from hot </span>air<span> to </span>cold air<span> or from </span>cold air<span> to hot </span>air<span> it will refract.</span>
