Syeda Afia Zehra on Nearpeer MDCAT Common Room

Biology Assignment: @Sir Hamza Question: Which specie is not evolved over the last 64 million years and does not have red blood? • That specie who is not evolved over the last 64 million years is known as ´´The Horseshoe Crab & AKA Living Fossil`` • Reasons: Why not red blood: They use copper (hemocyanin) to carry oxygen, while we use iron (hemoglobin). Why not evolve: Their armored body plan works so perfectly for survival that any major change would likely be a disadvantage.