Horses sleep while standing, unless it is necessary for them to get REM sleep. The amount of REM sleep needed is not much, so they will spend most of their time when sleeping, standing.
Multifactorial disorder
Multifactorial disorders are
disorders that involve variations in multiple genes joined with environmental
causes. Diseases such as heart disease, type 2 diabetes, and obesity are multifactorial
disorder as they do not have single genetic cause but are caused by a
combination of environmental factors and life style with mutations in multiple
genes.
1- Paleozoic era
2- mesozoic era
3- Cenozoic era
Skeletal and Muscular Systems
I cannot under stand you sorry can’t help you.
