The cell membrane is made up of a double layer of cellulose a single layer of cellulose a double layer of protein a double layer of phospholipids

Ablastocyst is a group of cells that forms after a human egg is fertilized. the blastocyst consists of two types of cells. some of these cells will become the placenta. what do the other cells develop into?

Why is it important to study each branch of earth science?

Milk production during breastfeeding is increased by the suckling of a newborn from his mother's nipple. this type of feedback mechanism best describes a positive or negative