The lower mantle is : A) thicker than the crust
B)made of iron and nickel
C) more firm than the upper mantle
D) hotter than the upper mantle

Leila has dimples because she received a gene copy from her father that coded for dimples. this means that dimples are an example of a trait that is

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?

The picture showed normal blood cells which are around and sickle cells which appear much longer people with sickle-cell suffer from the sickle cell anemia which is inherited diseaseit is caused by a change in gene responsible for production of hemo goblin this type of change is known as an