How was the Cretaceous period different from the Jurassic Period? a.
The Jurassic period had angiosperms, while the Cretaceous did not.
b.
Pangaea split during the Jurassic period.
c.
There were dinosaurs in the Jurassic period, which went extinct in the Cretaceous period.
d.
Conifers and ferns were present in the Jurassic period, but not in the Cretaceous period.

How are gene and protein sequences used to classify organisms?

Ricardo notices that when he plays soccer in the rain, his ball does not seem to go as far after a kick. what is the best scientific question that ricardo could ask about this observation? is soccer better played in the rain or sun? how does rain affect the distance a soccer ball can travel? how does rain affect the speed of a soccer ball? is soccer affected by the rain?

What do genes contain the code for?