A virus isn't really "alive" in the technical sense, but there are engineered strains of this and that which could kill billions if they were turned loose. And which creature stands behind them? Man.
Hippopotamus.
A lion seal I think!
Because it is so well armed!! Lol!
Man is probably to answer to both.
a tiger
Giraffe
A crocodile
Dart Frog
possibly plankton
The human baby.
they r the most adorable creature on earth!!!!!!!!!
...believe it or not but amoung the top 25 most dangerous animals in the world....coming in first placeis the misquito.... As small as it is though, it is also the deadliest. It has been estimated that mosquitos transmit diseases to almost 700 million people annually resulting in 2 to 3 million deaths every year.