Answer:

Explanation:
Predators are those animals which hunt prey. Prey is the animals which is "hunted".
When the prey population is less (a decrease in prey population), There will not be more animals for "predators" to hunt and so, the competition of living will become more. Decrease in preys population would lead to a decrease in predator's population because many predators will die of hunger.
![\rule[225]{225}{2}](https://tex.z-dn.net/?f=%5Crule%5B225%5D%7B225%7D%7B2%7D)
Hope this helped!
<h3>~AnonymousHelper1807</h3>
You didn't attach the problem. Without it, I can't help you. Sorry.
Most probably these scientists will do more studies and experiments in order to learn more about the subject. For example, if they compare plastic grocery bag with paper grocery bag it is important to investigate which one is a better resource use in the life cycles, which one is better for manufacturing or whether one of them can be reused. There are many questions about this issue.
Answer:
The correct answer is -
Support - it is helpful in identifying and locating criminals who do the heinous crime.
Against - It has its own flaws like if the sample increases there would be chances of false matching or error.
Explanation:
The national DNA database is a database that stores DNA profiles of the criminals found from the crime scenes to find and identify criminals like murderers and others. It has been found a very helpful tool for fighting with the crime.
However, there are some flaws and ethical issues with this database as there are chances of error and false matching of DNA match if the sample keeps increasing or there would any manual or system error and innocent can be punished for crime done by others.