Answer : Tobacco

In 1983, the tobacco plant was genetically engineered to be resistant to certain herbicides.READ MORE

Answer : Sperm Whales

The average Sperm Whale's brain weighs more than 20 pounds (9 kilograms) which is about 4 times heavier than the average human brain.READ MORE

Answer : Oxygen

Oxygen is the most common element in the human body, making up almost 63% of the average human, followed by carbon (19.37%), hydrogen (9.31%), and nitrogen (5.14%).READ MORE

Answer : The digestive system
Answer : Heart