Resultado de búsqueda
25 de may. de 2024 · e. The evolution of mammals has passed through many stages since the first appearance of their synapsid ancestors in the Pennsylvanian sub-period of the late Carboniferous period. By the mid- Triassic, there were many synapsid species that looked like mammals. The lineage leading to today's mammals split up in the Jurassic; synapsids from this ...
Hace 2 días · Marsupials have the typical characteristics of mammals —e.g., mammary glands, three middle ear bones, (and ears that usually have tragi, [3] varying in hearing thresholds [4]) and true hair. [5] There are, however, striking differences as well as a number of anatomical features that separate them from eutherians .
Hace 3 días · Human evolution. The hominoids are descendants of a common ancestor. Human evolution is the evolutionary process within the history of primates that led to the emergence of Homo sapiens as a distinct species of the hominid family that includes all the great apes. [1]
10 de may. de 2024 · A skull and partial skeleton commonly known as the La Brea Woman . The remains of a woman between 18 and 24 years old who died of a fractured skull. This skeleton represents the only known human remains from the tar pits. She was found alongside a grinding stone and may have been buried in the tar.
Hace 2 días · Theria. Marsupialia. Placentalia. A mammal (from Latin mamma 'breast') [1] is a vertebrate animal of the class Mammalia ( / məˈmeɪli.ə / ). Mammals are characterized by the presence of milk -producing mammary glands for feeding their young, a neocortex region of the brain, fur or hair, and three middle ear bones.
Hace 2 días · Cattle. Cattle ( Bos taurus) are large, domesticated, bovid ungulates widely kept as livestock. They are prominent modern members of the subfamily Bovinae and the most widespread species of the genus Bos. Mature female cattle are called cows and mature male cattle are bulls.
Hace 2 días · Didelphimorphs are small to medium-sized marsupials that grow to the size of a house cat. They tend to be semi- arboreal omnivores, although there are many exceptions. Most members of this order have long snouts, a narrow braincase, and a prominent sagittal crest. The dental formula is: 5.1.3.4 4.1.3.4 × 2 = 50 teeth.
