• Ahora completa el siguiente texto descriptivo siguiendo la clasificación anterior y mencionando una característica de cada grupo de animales Los mamiferos son animales vertebrados de temperatura constante cuyo embrión se desarrolla casi siempre dentro del cuerpo materno. De acuerdo con sus características específicas, se pueden dividir en varios grupo. Ayuda

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.

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these macromolecules could either be amino acids, proteins or nucleic acids. they are responsible for the chemical changes and reactions that affects largely the cell and its composition. take for instance the cytoplasm of the cell where these organelles are settled. these simple organelles are composed of macromolecules which ignites and catalyses different functions that enables cells, in macro-perspective in motion and metabolism. in intestines for example, metabolism happens and breaking down parts of a food to simpler compounds that are used and these nutrients delivered throughout the body and again broken down by into smaller components.