We just admit that some

Animals are male and female, but what is male and female will not be further investigated.

What do you mean? What is the essence of masculinity? What is the fundamental definition of women? We think that mammals.

Nature defines gender through various characteristics, such as having a penis, having children and having special milk.

Breast, some chromosome characteristics, and so on. For mammals, these judgments about individual sex

The standard is understandable, but for ordinary animals and plants, this standard is not much better than wearing long pants.

It is more reliable as a criterion for judging human gender. For example, frogs have no penis, whether male or female.

In this way, the words male and female may not have the usual meaning. After all, they didn't.

But it's only two words. If we think they are useless to explain the sex of frogs, we can

So as not to use them. If we are happy, we can randomly divide frogs into sex 1 and sex 2. however

Gender has a basic feature, which can be used to identify the male and female of all animals and plants.