Based on the clue 'both the squid the snail are members of this anim...', what is the answer?

Based on the clue 'both the male female tsetse fly drink this only t...', what is the answer? Based on the clue 'both the neman vistula rivers flow into this euro...', what is the answer? Based on the clue 'both the ounce this unit of measure get their nam...', what is the answer? Based on the clue 'both the parents of this serb dictator committed s...', what is the answer? Based on the clue 'both the staff of asclepius this staff of mercury...', what is the answer? Based on the clue 'both the un charter the nato pact were signed by ...', what is the answer? Based on the clue 'both these foods the 2 main ingredients in succota...', what is the answer? Based on the clue 'both this country the rio de la plata its major r...', what is the answer?