Gracie squeezed some grapes and kept the juice in a vessel for 5 days at room temperature. on the fifth day she found that the juice tasted sour and appeared frothy.
what caused this change

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?

Rotenone is an insecticide that is toxic

What happens when the cell copies its chromosomes