The right order is BDCA.
Remember, the right order is always the most coherent paragraph.
By reading these sentences, we know that they are all about adaptive behaviour. Therefore, Option B would open the argument. This is followed closely by Option D which explains in further detail what exactly “...to consider it equivalent to...” means. Option C then tells us more about structural “information we receive from our senses”. Option A tells us which kind of structure “living things” exhibit and concludes the paragraph.