Dna samples can be separated according to size using the technique of
(1) chromatography (3) replication
(2) electrophoresis (4) dissection

Option 2

Explanation:

Electrophoresis or in general known as "Gel electrophoresis" is a process by which separates and arranges DNA as per their size. In this process, DNA samples are placed at one end and at the other end electric current is applied. As we know that DNA fragments carry negative charge on them, hence they move towards the positively charged electrode. Also, all the DNA fragments have the same charge on it, therefore the larger the DNA fragment the more negatively charged the DNA is and hence the more rapidly it moves towards the positive electrode.  

At the end of the electrophoresis, same-sized DNA fragments arrange themselves in a row.  

Hence, option 2 is correct

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.

-hails tea

explanation:

-t poses