Which of the following steps has not yet been accomplished by scientists studying the origin of life? a) synthesis of small rna polymers by ribozymesb) abiotic synthesis of polypeptidesc) formation of molecular aggregates with selectively permeable membranesd) formation of protocells that use dna to direct the polymerization of amino acidse) abiotic synthesis of organic molecules

Which of the following statements is most likely correct about a rock belonging to the jurassic age and a rock belonging to the cambrian age? options: 1) they have identical fossils of organisms that have evolved over time. 2) both have animal fossils preserved in them due to weathering and erosion. 3) they contain different fossils because life on earth has changed through time. 4) the fossils in them were formed on the surface of earth due to exposure to sunlight.