What defines an air mass?

the humidity is consistent at a specific altitude.

the temperature is consistent at a specific altitude.

the temperature and humidity are consistent at a specific altitude.

the temperature and humidity are consistent at all altitudes.

What is the answer for the complicated molecules that make up living things usually contain carbon. why is carbon so important in these molecules?

Four different thermometers were used to measure the temperature of a sample of pure boiling water. the measurements are recorded in the table below. thermometer temperature reading 1 temperature reading 2 temperature reading 3 w 100.1°c 99.9°c 96.9°c x 100.4°c 102.3°c 101.4°c y 90.0°c 95.2°c 98.6°c z 90.8°c 90.6°c 90.7°c the actual boiling point of pure water is 100.0°c. what can be concluded from the data about the reliability and validity of the thermometers?

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