Aresearcher presents his dog with a bowl of normal dog food and a bowl of vitamin enriched dog food. he then records the amount of each type of food the dog consumes as a measure of his dog's food preference. what kind of measure has the researcher used?

each of the 46 original chromosomes splits into two daughter chromosomes, so there are two sets of 46 daughter chromosomes that end up in each cell. human cells have 46 chromosomes. each chromosome consists of a pair of identical chromatids attached together by a structure called a centromere.

amber has allowed scientists to study dna that has been preserved over millions of years.