Variation and Classification
About this Lesson
In order to categorize the vast array of living organisms on our planet, biologists have developed a classification system that groups them into various categories. With approximately 10 million distinct species to sort through, this system has become a crucial tool for organizing our understanding of the natural world.
To begin with, the system classifies organisms into different kingdoms. The two primary kingdoms are the plant kingdom and the animal kingdom.
The animal kingdom is then further subdivided into two groups: vertebrates and invertebrates. Vertebrates are animals that have a backbone, whereas invertebrates are those that lack one.
Of the vertebrates, there are five main types: fish, amphibians, reptiles, birds, and mammals. All mammals, including humans, share a number of key characteristics, such as maintaining a constant body temperature, breathing with lungs, possessing body hair or fur, giving birth to live young, and producing milk to feed their offspring.
There are more to explain, you can learn all of them just using the activity tool above. Just listen and understand.