Mammalia
Mammalia is a class of animals within the phylum Chordata. Mammals are characterized by several unique features, including the presence of mammary glands, hair or fur, and a neocortex region in the brain.
Key Features of Mammals:
- Mammary Glands: Mammals produce milk to nourish their young.
- Hair or Fur: Most mammals have some form of hair or fur covering their bodies.
- Neocortex: This region of the brain is involved in higher functions such as sensory perception, cognition, and motor commands.
- Endothermy: Mammals are typically warm-blooded, maintaining a relatively constant internal body temperature.
- Viviparity: Most mammals give birth to live young, rather than laying eggs.
Classification of Mammals:
Mammals are further classified into several subclasses, orders, families, genera, and species. Some common mammalian orders include Primates, Carnivora, Rodentia, and Cetacea.
Examples of Mammals:
There are over 5,400 species of mammals, including well-known animals like humans, elephants, dolphins, dogs, cats, and many more.
Mammalian Evolution:
Mammals are thought to have evolved from synapsid reptiles during the late Triassic period, around 200 million years ago. Over time, mammals diversified and adapted to various ecological niches.
Study Tips:
- Memorize the key features that define mammals, such as mammary glands, hair or fur, and the neocortex.
- Learn about the different orders of mammals and their characteristics.
- Explore the diversity of mammals by studying examples from different habitats and ecosystems.
- Understand the evolutionary history of mammals and how they have adapted to their environments over time.
[Mammalia] Related Worksheets and Study Guides:
.◂Chemistry Worksheets and Study Guides High School. Matter and Energy
Worksheet/Answer key
Matter and Energy 
Worksheet/Answer key
Matter and Energy Worksheet/Answer key
Matter and Energy
Worksheet/Answer keyWorksheet/Answer keyThe resources above cover the following skills:
PHYSICAL SCIENCE (NGSS)
Matter and Its Interactions
Students who demonstrate understanding can:
Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.
Energy
Students who demonstrate understanding can:
Develop and use models to illustrate that energy at the macroscopic scale can be accounted for as either motions of particles or energy stored in fields.