Define the following terms:
$1.$ Template strand
$2.$ Semi-conservative replication

(N/A) $1.$ Template strand: The strand of $DNA$ that acts as a template for the synthesis of a complementary $DNA$ or $RNA$ strand during replication or transcription is called the template strand.
$2.$ Semi-conservative replication: $A$ mode of $DNA$ replication in which the two strands of the parental $DNA$ molecule separate,and each serves as a template for the synthesis of a new complementary strand. As a result,each daughter $DNA$ molecule consists of one parental strand and one newly synthesized strand.