That they are <span>caused by microorganisms.</span>
First question is - Why do we have limestone? Formed from this type of sediment are biological sedimentary rocks. Their biological organ is often revealed in the rock fossils. Some limestones can form by direct precipitation of calcium carbonate from marine or fresh water. (The second question is) - What do iron bands mean? The rocks are "banded" because the iron minerals deposited in alternating bands with silica and sometimes shale. The banding might have resulted from seasonal changes in organism activity steel mill. Most iron ore is used to make steel. Here a steel slab is being cut to length in a steel mill.
Wild boars were brought to the United States by humans.Wild boars have quickly spread through the United States.Wild boars have established successfully in areas with warm climates.<span>Wild boars have a high reproductive rate and no natural predators. the answer is (c)
</span>
