B.
The tundra climate is a transitional climate between the Subarctic and ice cap climates. It is a region of rolling to nearly level terrain almost entirely devoid of trees. Polar climates like the tundra are characterized by very cold temperatures and generally dry conditions.
One example of stimulus is reacting to a hot pan. If you touch it, you immediately pull your fingers back. This is your nervous system sending alerts through your body, and to your muscular system. Your muscular system allows you to bend your arm, and move your fingers away from the hot pan.
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Answer:
rain is very important for life in certain areas, this is why you see little life in deserts and even they need rain occasionally. more rain will lead to more life, first, it will be the plants that move in, then once they grow, vegetation eaters will move in, then after that meat-eaters will move in to eat those creatures and the ecosystem will flourish.
Which disease symptoms u would like to know?