Answer:
Because of the breeds
Explanation:
Like in humans, the dogs belong to the same scientific group, but through the passing of time, there has been some changes in their DNA, slightly differences that make the size, the hair, and another traits to be different.
In humans all the "breeds" suffer the same changes, that is the reason that spite we are homo sapiens, there are different groups of humans as the oriental, Caucasian, etc.
Your lungs infuse the blood with oxygen and get rid of the carbon diox
<span>the digestive system extracts glucose from the food you eat and deposits it in the blood </span>
<span>the circulatory system moves the oxygen, glucose, and carbon diox through our bodies enabling the cells to get the materials they need and remove the ones they dont</span>
To take the percent by mass of this element, we use the
formula:
% mass = (mass of element / mass of ore) * 100%
% mass = (47.5 g / (660 kg * 1000 g / kg)) * 100*
<span>% mass = 7.20 x 10^-3 %</span>