What type of material would a seismic wave travel through fastest

Why does the earth spin slowly, not faster? is it possible to prove it scientifically? can you prove it with math?

24. how are vaccines used to keep people healthy?

In cattle a single gene with two alleles determines fur color the fur can be red white or roan roan fur has both red and white hair which of the following statements is true a the allele for roan fur color is dominant over red and white fur color b the allele for red fur color is dominant over white and roan fur color c the roan and white alleles are expressed independently of the other d the red and white alleles are expressed independently of each other