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.
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Worksheet/Answer keyWorksheet/Answer keyThe resources above cover the following skills:
Nature of Science
The Practice of Science - A: Scientific inquiry is a multifaceted activity; The processes of science include the formulation of scientifically investigable questions, construction of investigations into those questions, the collection of appropriate data, the evaluation of the meaning of those data, and the communication of this evaluation. B: The processes of science frequently do not correspond to the traditional portrayal of ''the scientific method.'' C: Scientific argumentation is a necessary part of scientific inquiry and plays an important role in the generation and validation of scientific knowledge. D: Scientific knowledge is based on observation and inference; it is important to recognize that these are very different things. Not only does science require creativity in its methods and processes, but also in its questions and explanations.
Define a problem based on a specific body of knowledge, for example: biology, chemistry, physics, and earth/space science, and do the following:
Use tools to gather, analyze, and interpret data (this includes the use of measurement in metric and other systems, and also the generation and interpretation of graphical representations of data, including data tables and graphs)