Answer:
Superior vena cava
Explanation:
Of the two vena cava, the superior vena cava is the large vein without valves that is responsible for conveying de-oxygenated blood from the upper extremities and body (neck, chest, arm and head) above the diaphragm to the right artrium.
Although the superior vena cava is a large vein, it also short; it is about 2 cm wide and 7 cm long.
When there is an obstruction of the superior vena cava, it can result to the enlargement of the veins and could lead to chest pain and breathlessness.
Absolute Brightness
Absolute brightness represents
the total amount of energy emitted from a celestial object. It is the measure
of the true brightness of a star or other celestial object as it would be as
seen from a standard distance<span> of
exactly 10 parsecs (32.6 light-yea</span>rs). The more luminous an object, the smaller the
numerical value of its absolute magnitude or brightness.
Answer:
The answer is A or number 1
Explanation:
Answer: A. Mesopelagic zone
Explanation: This zone is referred to as the "middle zone" within oceanic waters. Not yet the deep zone, however past the top layer aka upper ocean.
Hope this helps ^^
