Potassium-40 has a half life of 1.251×billion<span> years</span><span>. To determine the percentage potassium-40 remaining after 3.9 billion years, divide
3.9 by 1.251, = 3.12.
This is the number of times the original amount of potassium-40 reduces by 50%. The remaining percentage is therefore 100%/(3.12 * 2) = 16.03%.</span>
Microevolution refers to changes that occur within a single species or group or organisms. Microevolution, as opposed to macroevolution, occurs in a short period of time. In microevolution, the ancestor and the descendant obviously belong to the same type. For example, certain pests have evolved in such a way that they become immune to pesticides; the same thing has happened to certain weeds and herbicides. Hope this helps.
The two plates grab onto each other and lock in place is not a resulting situation of two plates colliding at a convergent boundary. When two plates colliding at a convergent boundary, what happenes is that one of the boundary either goes under or on top of the under, in order to release the energy that the two have stored because of the collision.
The process of making multiple copies of a gene by inserting it into a host genome and culturing the host is an example of gene cloning.
