Which structures in the diagram above connects the umbilical vein with the vena cava and connects the pulmonary artery with the aorta?

a, the ductus arteriosus; d the ductus venosus
b, the ductus arteriosus; d the ductus venosus
b, the ductus venosus; d the ductus arteriosus
a, the ductus venosus; d the ductus arteriosus

Option). B the ductus venosus; D the ductus arteriosus

Explanation:

In fetal circulation, the structure that connects the umbilical vein with the vena cava is known as ductus venosus. It allows transfer of oxygenated blood to bypass the fetal liver from the placenta. In given diagram, it is represented by letter B.

The structure that connects the pulmonary artery with aorta is known as ductus arteriosus. It allows flow of blood to the aorta from pulmonary artery, which is then transported to placenta for oxygenation.  In given diagram, it is represented by letter D.

answer:

the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.  

rising temperatures because when water vapor in the air is cooled, it condenses. it turns back into a liquid and attaches to dust particles in the air. these very small water droplets group together to form clouds