An animal's eggs will be hatched by the microorganisms in the soil and the heat generated when compost breaks down organic matter, but these microorganisms (including bacteria) can also penetrate the eggshell and infect the embryo, which naturally exceeds 20%. However, there is a bird named Congzuo Pheasant in Australia, whose egg infection rate is only 9%. The researchers found that the eggshell contains lysozyme, and the researchers believe that this substance is likely to resist The key factor for bacterial infestation. Which of the following, if true, does not weaken the above conclusion? ['The amount of lysozyme in the eggshell of Congzuo Pheasant is about the same as that of other animals.', 'The egg shell of Congzuo Pheasant is wrapped by a layer of nanometer calcium carbonate, which has stronger water resistance and resistance to bacterial invasion.', 'Congzuo Pheasant emits a special smell, which will reduce the number of bacteria attached to its eggshell.', 'Compared with the egg shells of other animals, the egg shell of Congzuo Pheasant is one-third thinner and more vulnerable to microbial invasion.']