arthropods considered to be the most advanced invertebrates but they are not believed to be our closest ancestor give reason
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First of all, let me clear you that arthropods are not most advanced invertebrates. Rather, echinoderms are considered as most advanced invertebrates. Arthropods can not be the close ancestors of humans because arthropods are invertebrates and human beings are vertebrates i.e. arthropods don't possess notochord (vertebral column). Humans belong to the phylum chordata which holds the highest position in the hierarchy of classification. So, obviously human beings have advanced mechanisms of respiration, blood circulation, reproduction, digestion as compared to arthropods.
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