The single defining characteristic of the mammals is the presence of?
mammary glands.
a placenta.
hair.
warm blood.
a skul
Look up the meaning of mammal.
its placenta..
No.
http://www.merriam-webster.com/dictionary/mammal
Hair is part of it so hair
The single defining characteristic of mammals is the presence of mammary glands.
Mammary glands are specialized glands in female mammals that secrete milk, which is used to nourish and feed their young. This ability to produce milk is a unique and defining characteristic of mammals. It distinguishes them from other vertebrates, such as birds, reptiles, and amphibians, which do not have mammary glands.
To find the answer to this question, you would need to have prior knowledge about the defining characteristics of mammals. There are many resources available to learn about animal classifications and specific characteristics. Biology textbooks, educational websites, and online encyclopedias are good sources to consult when seeking information about the characteristics of mammals or other animals.