Cat, small, mainly carnivorous animal, Felis silvestris catus, member of the family Felidae, popular as a household pe…

We live in the extended atmosphere of an active star. While sunlight enables and sustains life, the Sun's…

Heart , in  anatomy , hollow muscular organ that pumps blood through the body. The heart, blood, and blood vessels m…

Heart , in  anatomy , hollow muscular organ that pumps blood through the body. The heart, blood, and blood vessels …

The  nervous system  has two divisions: the central nervous system and the peripheral nervous system. The central nerv…

The human ovum, fertilized high in a fallopian tube, is brushed by the hairlike cilia in the tube toward the uterus, w…

The human ovum, fertilized high in a fallopian tube, is brushed by the hairlike cilia in the tube toward the uterus, w…

The human ovum, fertilized high in a fallopian tube , is brushed by the hairlike cilia in the tube toward the uterus…

The human ovum, fertilized high in a fallopian tube, is brushed by the hairlike cilia in the tube toward the uterus, …

The human ovum, fertilized high in a fallopian tube, is brushed by the hairlike cilia in the tube toward the uterus, …