It is often claimed that height is bi-modal because there will be one modal height for men and one for women. But unless there are exactly the same number of men and of women in the modal class, both cannot be modes. Consequently, this attribute really has only one mode. The same applies to other characteristics.
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They are said to be Normally distributed.
The binomial distribution.
The normal distribution would be a standard normal distribution if it had a mean of 0 and standard deviation of 1.
Not all statisticians would agree that the statement is true.
That would provide some evidence that the distribution is symmetric about the mean (or median).