astronomy
what is the hottest plant in the solar system
venus
what is the largest internal organ in the human body
liver
what element did Marie Curie discover
radium
which planet is known for its prominent rings
saturn
how many bones are in the adult human body
206
what is the symbol for sodium on the periodic table
Na
what is the chemical symbol for water
H2O
what part of the brain is responsible for memory and learning
hippocampus
what is the hardest natural substance on earth
diamond
what is the name of the force that keeps you on the ground
gravity
what gas do humans need to breathe to survive
oxygen
what is the process by which plants convert sunlight into energy called
photosynthesis
what is the process of water turning into vapor called
evaporation
what do you call an animal that eats only plants
herbivore
what is the smallest unit of life
cell