If the water concentration inside a cellis higher than the water concentration outside the cell, water flows out of the cell. This method of molecular transport is called

During the winter, this species of fox has white fur, but in the summer, it has brown fur. what environmental change may have lead to this fox's fur color? snow cover increase in sun's brightness volcanic eruption global warming

Witch theory suggests all living things are made up of cell or cells

When ash and dust begin to settle on the ground, they eventually become compacted by