Students planted three bean seeds after several days, they observed that the seeds' roots were growing downward into the soil which type of tropism were the roots displaying a. geotropism b. thigmotropism c. phototropism d. photoperiodism

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.

the function of the protein macromolecule is to move things in and out of the cell and transport other molecules in the body. there are many functions of proteins. they are the basic building blocks of living things and are responsible for the growth and repair of body cells and tissues.

explanation: