The universe is estimated to be how old?
a. 2 million years
b. 4 million years
c. 4.6 billion years
d. 13 to 14 billion years

Which traits do human embryos have that link them to a common ancestor with fish and reptiles? a. scales and tail b. gill slits and scales c. tail and gill slits d. hair and tail

What three things determine the shape and size of a puddle when water is poured out onto a surface

What is another way to determine mass times acceleration?