Spallanzi did experiments to disprove the law of spontaneous generation. he sealed his jars so that air could not get in. supporters of spontaneous generation argued that without air nothing could live. how did pasteur’s experiment show once and for all that spontaneous generation does not occur?

Kidney stones are tiny crystals of calcium or magnesium that block the narrow sections of the excretory system. which symptoms would a person with kidney stones experience? a. inability to store urine; pain in the bladder b. inability to store urine; pain in the urethra c. reduced urine flow; pain in the bladder d. reduced urine flow; pain in the urethra