Why do the two possible pcr products differ in size by 300 base pairs?

 The correct answer is :  They differ in size because One has an insert and one does not

Explanation:  PCR means polymerase chain reaction. The objective of PCR is to produce a large amount of DNA in a test tube from a small amount. PCR has had a great impact on gene mapping, DNA sequencing, gene testing and cloning.

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]