Answer: 1. Plastics are polymers. A polymer is a substance made of many repeating units. The word polymer comes from two Greek words: poly, meaning many, and meros, meaning parts or units. A polymer can be thought of as a chain in which each link is the “mer,” or monomer (single unit). 2. Carbon is the only element that can form so many different compounds because each carbon atom can form four chemical bonds to other atoms, and because the carbon atom is just the right, small size to fit in comfortably as parts of very large molecules. ... They can even join "head-to-tail" to make rings of carbon atoms. An example of two molecules that contain carbon is compound methane ( 1 carbon bounded to four hydrogen. ) ... Carbon is able to form so many molecules/compounds because each carbon atom can form four chemical bonds to other atoms and, because of its size, it fits in nicely as part of large molecules. 3. Carbohydrates- Monosaccharides (simple sugars), Lipids- Fatty acids and glycerol, Proteins- Amino acids, Nucleic acids- Nucleotides. brainliest??
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<u>True!</u>
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The longest geologic era was the Precambrian. It began with the formation of the earth about 4.53 billion years ago, and ended about 542 million years ago.
This means this period lasted approximately 3.98 billion years!
As such it's undoubtedly the longest geologic era by a long shot!
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Composite, shield, cinder cones, and supervolcanoes are the main types of volcanoes.
Composite volcanoes are tall, steep cones that produce explosive eruptions.
Shield volcanoes form very large, gently sloped mounds from effusive eruptions.
Volcanoes have several shapes, which are controlled by the composition of the magma and the nature of its eruption. If a volcano produces very fluid lava (low in the compound SiO2, or silica), the magma flows a long distance before it cools, making a flat, shield-shaped volcano.
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Because everyone has blood pressure if it gets high or low then there’s a problem