The pig heart is big,and the chicken heart is small.
The answer is D) the organ system.
I believe it is a. Birds typically migrate in the wintertime to escape harsher climates to places that have more food. Also, some birds migrate to certain places when they are about to start their nesting and breeding seasons.
The DNA synthesis process is continuous on one strand while discontinuous on the other because of the fact that the DNA polymerase can add new nucleotides to the newly replicated strand only at the 3'end. The two strands of the DNA are anti-parallel, and so during the process of replication the DNA polymerase only works by adding new nucleotide from the 3' end. This leads to the synthesis of a continuous strand on one template stand, and the formation of the okazaki fragments on the another.
Hence, the correct answer is 'Option B and Option D'.
