Question 21.
Frank packs and weighs his school backpack. The backpack weighs
3 pounds. Then Frank puts in a textbook that weighs 25 pounds and
removes a notebook that weighs 8 ounces. Which expression can be used
to find the weight of the backpack now in ounces? (1 pound = 16 ounces)
A 48 + 32-8 C 60 + 32 - 8
B 48 + 40 - 8
D60 + 40 - 8

2. how does the miller-urey experiment fall short of demonstrating that life can arise from inorganic molecules? explain. a. it doesn't show a leap between a collection of amino acids and a single-celled organism. b. it recreates the conditions that existed at the earth's beginning, but no molecules form as a result. c. it doesn't provide evidence of the formation of amino acids. d. it doesn't show how multicellular organisms developed from unicellular organisms