1)why stomata genrally opens during day time ? 2)which parts of plant intake CO2 and give out O2 , takes in O2 and give out CO2 during day time ?

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