Mammals are a class of vertebrate animals characterized by the presence of mammary glands which produce milk for feeding their young. They are also distinguished by their hair or fur, and typically give birth to live young.
Characteristics of Mammals
Mammary Glands: Mammals have mammary glands which are used to produce milk for their offspring.
Hair or Fur: Most mammals have hair or fur covering their bodies, which helps to insulate and protect them from the environment.
Warm-blooded: Mammals are warm-blooded, meaning they can regulate their internal body temperature independently of the external environment.
Viviparous Reproduction: Mammals give birth to live young, as opposed to laying eggs like reptiles and birds.
Sensory Adaptations: Many mammals have acute senses of hearing, smell, and vision, which help them locate food, avoid predators, and communicate with others of their species.
Mammals play crucial roles in ecosystems as predators, herbivores, seed dispersers, and pollinators. They also contribute to nutrient cycling and help maintain the balance of natural communities.
Human Interactions with Mammals
Humans have domesticated certain mammals for food, labor, companionship, and other purposes. Additionally, mammals have been the subject of scientific research, conservation efforts, and environmental education.
Energy - A. Energy is involved in all physical and chemical processes. It is conserved, and can be transformed from one form to another and into work. At the atomic and nuclear levels energy is not continuous but exists in discrete amounts. Energy and mass are related through Einstein's equation E=mc 2 . B. The properties of atomic nuclei are responsible for energy-related phenomena such as radioactivity, fission and fusion. C. Changes in entropy and energy that accompany chemical reactions influence reaction paths. Chemical reactions result in the release or absorption of energy. D. The theory of electromagnetism explains that electricity and magnetism are closely related. Electric charges are the source of electric fields. Moving charges generate magnetic fields. E. Waves are the propagation of a disturbance. They transport energy and momentum but do not transport matter.
Relate temperature to the average molecular kinetic energy.