Population decreases by 15.
Birth rate means more population (positive), death rate means less population (negative), immigration means more (positive), and emigration means less (negative). So, just add and subtract the appropriate numbers:

Negative 15 people means that the population decreases by 15.
<span>It gathers information about, also responds to, changes in the environment. Receptors respond to a stimulus and send impulses along sensory neurons to the CNS(Central Nervous System).
Hope this helps!
Thanks,
-xxred24
</span>
Answer:
The definition of trade off is an exchange where you give up one thing in order to get something else that you also desire. An example of a trade off is when you have to put up with a half hour commute in order to make more money.
Explanation: