En qué nivel de organización situarían a: una molécula de ADN,
una bacteria, un hígado, un cloroplasto, un trozo de hierro, un grupo de
palomas, un pez, un río con peces y algas, un pulmón. ¿cuál de estos niveles
tiene vida?

Which of the following is not considered an appendage of the skin? nails glands follicles none of the above

When listening the levels of orginization in orginisims from the smallest to most complex , which level is just below organs in complexity

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?