Any value that is set and cannot change is a variable. true, false/

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?

When a person is exercising the body needs to deliver increased amounts of oxygen to the muscles which component of blood ensures that the muscles will receive it

Identify two examples of chemical reactions that you have encountered during the last week. identify an exothermic and endothermic reaction. explain.