Answer:
The correct answer is - B. they build up soil deposits on the rocky ground.
Explanation:
Lichens and mosses are known as the pioneer species as they prepare the particular region for the next stages of succession on the bare volcanic region. Lichens and mosses grow on the bare rocks and secrete acids to break the rocks and start soil production.
The soil deposits produced by breaking the volcanic rocks by secreting acids from mosses and lichens. Even after dying these species leads to thickening of the soil and increase organic matter for the next stages to grow.
Type 2 diabetes has 2 causes: genetics (mutation in a gene or genes) and/or lifestyle poor choices (overweight, etc.), whereas AIDS is a result of being infected by a virus called HIV (human immunodeficiency virus). There's also a huge difference in how they are treated. Type 2 diabetics take medicine to help them monitor their sugar levels, they have to be careful about their diet and they have to exercise. HIV/AIDS patients have to take medicines that work to try and keep the HIV virus from replicating in their blood (T-cells) and to avoid getting sick - their immune system is seriously depressed.
<u><em>i think is coronary veins becuase those veins carry poor oxigenated blood.</em></u>
hope it helps
