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While organs are generally considered to have a single, specified function (or perhaps a group of closely-related functions), blood (the fluid inside the vessels, not the vessels themselves) has many different functions: deliver $O_2$ from lungs to cells remove waste $CO_2$ from cells to lungs respond to injury by clotting carry multiple different types of ...
Blood is considered a type of connective tissue (sometimes). However, an organ is formed of multiple different tissues. Thus, blood is a tissue, not an organ.
There are several subconcepts within the concept of robustness. Several definitions exist for all of these concepts and I am just suggesting one variant of the possible definitions below. Mutational robustness Might be defined as a function of the mean and variance of the distribution of mutational effects. Environmental robustness Might be defined as ...
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