World's Hardest Science Quiz You'll Ever Take!

According to NASA, the nitrogen level in the Earth's atmosphere is approximately 78%.

The given answer states that South America and Africa do fit together like a jigsaw puzzle. This suggests that the landmasses of South America and Africa can be aligned and connected in a way that resembles the interlocking pieces of a puzzle.

The correct answer is "Spheroid". This is because the Earth is not a perfect sphere, but rather an oblate spheroid. It is slightly flattened at the poles and bulging at the equator due to its rotation. This shape is a result of the Earth's gravity pulling the mass towards the center, causing it to be compressed at the poles and expanded at the equator.

A decapod is a type of crustacean that has ten legs. Crabs are one of the most well-known examples of decapods. They have a hard exoskeleton, a pair of claws, and a body that is divided into a cephalothorax and an abdomen. They are commonly found in oceans, seas, and other bodies of water, and are known for their sideways walking and ability to regenerate lost limbs.

The blue whale is the largest animal that is currently thriving. It is known to be the largest animal to have ever existed on Earth. With an average length of about 82-105 feet and weighing around 200 tons, the blue whale surpasses the size of any other animal. It is a marine mammal that primarily feeds on small shrimp-like animals called krill. Despite being hunted to near extinction in the past, conservation efforts have helped the blue whale population recover, making it the largest thriving animal today.

A graviton is a hypothetical particle in string theory that is believed to be responsible for carrying the force of gravity. It is considered weightless because it does not have mass. While the other options mentioned are not weightless particles, the graviton fits the description of a hypothetical string theory particle that is weightless.

While atoms make up all the matter we see (like stars, planets, and living things), they account for only about 5% of the total mass-energy content of the universe. A much larger portion, around 27%, is thought to be composed of dark matter, which interacts with gravity but not with light, making it invisible and detectable only through its gravitational effects. Anti-matter exists but is extremely rare, and none of the above would be incorrect because dark matter is believed to make up much of the universe's mass. The remaining majority of the universe is composed of dark energy.

The dodo's closest relative is the Southeast Asian Nicobar pigeon. This is because both species belong to the same family of birds, Columbidae. They share similar physical characteristics and behaviors, such as their large size and inability to fly long distances. Additionally, genetic studies have shown a close evolutionary relationship between the dodo and the Nicobar pigeon.

NaCl: This is the correct answer. NaCl is the chemical symbol for sodium chloride, which is the chemical name for common table salt. It consists of one sodium (Na) atom and one chlorine (Cl) atom bonded together.

The Quahog Clam is the longest-lived animal ever discovered, according to the Guinness World Records. These clams have been known to live for over 500 years.