Adds genetic variation, which is essential for evolution

What maintain homeostasis when a persons internal body temperature is 97.5°f

Which of the following forest management practices is best for reestablishing areas of forest?

Pls me i need this ! each cell has genes activated depending on it's job and what kind of cell it is. it is the presence of that causes the repressor protein to fall off and unblock the gene on the lac operon. if a gene is turned on then it is being an additional circular chromosome found in some bacteria that is used in genetic engineering.