How does the temperature of the stratosphere change when altitude increases? A. The temperature changes randomly.
B. The temperature increases.
C. The temperature stays the same.
D. The temperature decreases. ​

Natural resources are any materials that humans obtain from the earth to meet our wants and needs.

Which statement best explains why cells were observed in more detail using a compound microscope than a simple microscope? a compound microscope has greater magnification ability than a simple microscope. the compound microscope was invented before the simple microscope. a compound microscope is much easier to manufacture than a simple microscope. compound microscopes were more common than simple microscopes.

The variation among individuals, on which natural selection acts