is the first branch off the arch of the aorta is the brachiocephalic artery in both the sheep and the human.

TRUE

Explanation:

Both sheep and humans have similar heart anatomy.

The aorta has 4 parts: the

1. ascending aorta

2. arch of aorta

3. descending (thoracic) aorta

4. abdominal aorta.

The ARCH OF AORTA is a continuation of the ascending aorta and has 3 major branches

1. The brachiocephalic trunk- which is the first branch.

2. The Left common carotid artery

3. The Left subclavian artery

d.

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the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.