The leading cause is garbage and waste from people.
A gene transcription occurs when the RNA copy of a gene sequence is made.
<h3>What is gene?</h3>
Although your question is incomplete as the image is lacking but I will try to help you the much I can. Gene is a unit of inheritance found in the chromosomes.
A gene transcription occurs when the RNA copy of a gene sequence is made. The correct image can not be located as the image attachment is lacking.
Learn more about gene:brainly.com/question/787658
Classic conditioning
a learning process that occurs when two stimuli are repeatedly paired; a response that is at first elicited by the second stimulus is eventually elicited by the first stimulus alone.
