You are standing by a cliff far away from the ocean. You see a sedimentary layer with shells in it. You are told the shells are from oceanic organisms. How do you
think this layer formed?

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What is called the "building block" of life?

In the water cycle , when does water undergo a chemical change

Select the correct answer. tay-sachs disease is caused by a mutation in the hexa gene located on chromosome 15. tay-sachs follows an autosomal recessive pattern of inheritance. with the of the diagram, identify which of the offspring will be an unaffected carrier. a diagram showing the genes of parents who are carriers of tay-sachs disease a. a, b, and c b. b and c c. a and d d. a e. d