Scientists believe that there are three genes that contribute to skin color in humans. Which of these best describes the inheritance pattern of skin color?
O multiple allele in which offspring receive three alleles from each parent
multiple allele in which offspring receive three alleles from only one parent
polygenic in which offspring receive three alleles from each parent
polygenic in which offspring receive three alleles from only one parent

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.

the population of unionid mussels in the hudson river decreased after zebra mussels were introduced. zebra mussels, a nonnative species, competed with the unionid mussels for food. the zebra mussels were able to outcompete the unionid mussels, allowing the zebra mussel population to increase dramatically over six years. the unionid mussel population decreased due to a lack of food.

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