Which has prokaryotic cells
a. rose thorn
b. lactobacillus
c. beet root
d. human kidney

What type of specimens where you able to see under each of the microscopes in the microscope activity

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Ihave no idea how to solve these. plus there's another question that is 2) a 10 kilogram meteorite is collected in space and brought back to earth. it is composed of 1.25 kg of uranium-238 and 8.75 kg of lead-206. how many u-238 half lives have passed? what is the approximate age of the meteorite?