During fertilization, a zygote inherits DNA from both the sperm and the egg, but the mitochondria and its associated DNA a zygote contains are contributed solely by the
egg, not the sperm. Additionally, during the process of fertilization, the expected
outcome is that each chromosome from the egg has a homologous partner found in
the sperm; with the exception of the Y chromosome in male zygotes. Explain the
differences in patterns of inheritance between the genes in the nuclear DNA, the
mitochondrial DNA and the Y chromosome.

well the answer is 2!

bal is blood alcohol level. bac will normally be higher in a person with more body fat. so the answer to your question would be, as body fat decreases, the increasing rate of bal decreases.  

1. the geologists have established a set of principals that can can be used o determine the relative ages of rock. this principal is applied to sedimentary and volcanic rocks. the rocks exposed to wall of grand canyon has layers and by studying the number of horizontal layers in the rock(strata) the relative age can be determined. the layer first formed will appear at the bottom and the the layer of strata last formed appear at the top. by using this information the approximate age of rocks can be determined.

2. carbon dating is used to find the relative age of rock in numbers which means for the rocks that has age between 1-70,000 years.

3. for the rocks of age range between 1,000 - billion of years potassium-argon dating is used.