Molecules move between the nucleus and the cytoplasm through a. genes b. ribosomes c. pores d. chromosomes

It is C) pores

Molecules move betweeen the  nucleus and the cytoplasm through (pores).

The correct answer for the fill in the blank is C.  Pores.

There are specialized channels in the nuclear envelope( surrounding the nucleus of the cell). These channels are called as nuclear pore complexes or pores. They attach the inner nuclear membrane to the outer nuclear membrane and allow the passage of small molecules, which are polar in nature as well as larger macromolecules. Thus, through nuclear pore complex, transport of molecules take place between nucleus and cytoplasm.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.