Warm tropical air masses are associated with air with high moisture

cooler temperatures

air with less moisture

none of these

(EARTH SCIENCE)

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

the answer to your question is tooth decay.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.