What is the role of xylem in a vascular plant? OA. Transports carbohydrates from the leaves to the roots B. Transports salt to the roots of the plant C. Transports chloroplasts to the leaves of the plant D. Transports material from the roots up into the plant

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes