Answer:
That would be an isotope. An very common example is Carbon-14. Hope this helps.
Answer:A checkpoint is a stage in the eukaryotic cell cycle at which the cell examines internal and external cues and "decides" whether or not to move forward with division.
Explanation: Easy Peasy
The population of the organism. Either forcing some away or drawing the ones who can adapt in.
Light rays from an object after passing through a convex lens form an image at the focal point behind the lens (opposite side of the object), What is the actual position of the object? form an image
Because bacterial life cycle is very short it complete in 20 minutes to produce copies. secomdly bacterial genome is simple to be handle.
