MYSTERY CLUE To make the mouse gene work inside
the cells of a fly, researchers attached a new promoter
sequence to the gene. Why do you think they did that?

they have identical fossils of organisms that have evolved over time.

both have animal fossils preserved in them due to weathering and erosion.

they contain different fossils because life on earth has changed through time.

the fossils in them were formed on the surface of earth due to exposure to sunlight.

answer increasing the intensity, duration,and frequency of exercise progressively;