Generation 50 Generation 1
The phenotype represents the neck length of animals that feed on leaves growing to greater heights.
The phenotype represents the thickness of fat layers in mammals living in regions that are getting colder.
The phenotype represents the body mass of insects in regions where predators prefer larger insects.
The phenotype' represents bone density for birds that live and feed underwater.

i guess because love can be toxic ‍♂️

the correct answer is: " ventricles " .

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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.