An animal is a multicellular, eukaryotic organism that belongs to the biological kingdom Animalia. These organisms are characterized by their ability to move, breathe oxygen, and eat organic materials. They also reproduce sexually. Among their many attributes, animals are highly intelligent, multifaceted creatures. This article explores different types of animals and their characteristics. Listed below are some popular types of animals. Read on to discover more about them.
Animals are grouped into three major categories: aquatic, terrestrial, and marine. Marine animals are the largest, and their size is unparalleled. Both land and marine plants have different habitats. Most animals live in water, but marine creatures reach whale-size. Their diversity of form and function is less apparent to humans, but animals represent three-quarters of all species on Earth. They are also adaptable, following every known mode of living. Animals are the most diverse and complex of all living organisms.
An undergraduate degree in animal science usually takes four years to complete. Many animal scientists pursue a master’s degree in their field. This level of education can make them more qualified for research-related jobs. A master’s degree typically takes two years to complete. And some continue their education by pursuing a PhD, which takes three additional years. However, an undergraduate degree in animal science will serve you well enough to pursue your professional goals. This degree will give you a wide range of knowledge and skills.
Throughout history, animal experiments have been conducted to help scientists understand the workings of certain drugs and medical conditions. The vast majority of biologists and leading biomedical organizations support the use of animals for research. According to a recent Pew Research Center poll, 89% of scientists support animal research. However, several health organizations are against animal testing. Consequently, the use of animals in research is a necessary part of progress in medicine, but its use is still controversial in the world of health.
The NHMRC argues that the justification for animal rights is based on differences in animal experiences. For example, a canine breed champion may have perfect conformation but be fearful in its home environment. Other physical parameters are difficult to interpret. For instance, plasma cortisol levels are often elevated in response to positive or negative experiences. If this is the case, animal research should take into account the emotions of an animal in research. The NHMRC is encouraging the use of animals for research in all forms of life sciences.
The Cenozoic period lasts for 66 million years and is notable for the rise of mammals. These apes ultimately evolved into hominids. The last of these species, Homo sapiens, is the only extant species. The fossil record of Homo species demonstrates that they evolved over millions of years. The modern animal phyla consists of three major categories: protozoans, dinosaurs, and humans.