what killed the dinosaurs?
how much bacteria is in your body?
how many brain cells do you have?
86 billion
how many cells the slipper animalcule have?
one cell
how many cells in the human body?
thirty-seven point two trillion
what does good bacteria do?
keeps you alive
after how many months are babies born?
how old is the earth?
four point forty-six billion years
how fast is the speed of light?
186,000 miles per second
what came first in the universe?
what created the universe?
big bang
what was the first human like thing?
homo erectus
how long have humans been around?
200,000 years
what are genes made out of?
what is chalk made out of?