Deserts are areas that receive very little precipitation. They are arid ecosystems that receive fewer than 25 centimeters (10 inches) of precipitation a year. Death Valley, California, above, receives fewer than 5 centimeters (2 inches) of rainfall every year. However, Death Valley's infrequent rain and extreme temperatures can impact the landscape. This rock's path was created when rainfall produced a shallow lake, which formed a thin layer of ice. The rock was trapped in the ice as it scoured the desert landscape. The ice melted, leaving its tracks in the dried mud.
Answer:The unifying theme of the address, woven throughout from beginning to end, is the conception, birth, sacrificial death, and new birth of the nation.
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Explanation:
The lymphatic and immune systems work together by taking action against disease-causing agents. The two systems distribute the chief organs and they both rely on each other for their functions. The lymphatic system carries white blood cells and filters/cleanses circulation of blood and nutrients throughout the body. The immune system is activated by antigens, fighting the foreign bodies to protect its host.