The human circulatory system A) helps maintain a constant body temperature.
B) carries cells that help protect the body from disease.
C) helps the body regulate body temperature.
D) all of the above

Drag the tiles to the correct boxes to complete the pairs. match each cell organelle with its description.

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

What is an example of a scientific question that galileo could not have answered with out this new tool?