An animal's eggs will hatch by the microorganisms in the soil and the heat generated when the compost breaks down organic matter, but these microorganisms (including bacteria) will also penetrate the eggshell and infect the embryo. Naturally, this proportion is higher than 20%. However, In Australia, there is a bird named Cong Tzu Tiao, whose egg infection rate is only 9% . The researchers found that the egg shell contains lysozyme, and the researchers believe that this substance is likely to resist bacterial infestation. Key factor. Which of the following, if true, does not weaken the above conclusion? ['The amount of lysozyme contained in the eggshell of Cong Tzu Chong is comparable to that of other animals.', "Cong Tzu-chan's egg shell is covered with a nano-scale calcium carbonate layer, which has stronger water resistance and resistance to bacterial invasion.", 'Cong Tzu Tiao emits a special odor that reduces the number of bacteria attached to its eggshell.', 'Compared to the egg shells of other animals, the eggshells of Cong Tzu Tiao are thinner by a third and are more susceptible to invasion by microorganisms.']