What elements are in the air we breathe? The air in Earth’s atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen. What is our air made of? Standard Dry Air is made up […]

What are the uses of water vapor? Water vapor is also the most important greenhouse gas in the atmosphere. Heat radiated from Earth’s surface is absorbed by water vapor molecules in the lower atmosphere. The water vapor molecules, in turn, radiate heat in all directions. Some of the heat returns to the Earth’s surface. What […]

What are the polymers of nucleic acids called? Deoxyribonucleic acid Along with RNA and proteins, DNA is one of the three major macromolecules that are essential for all known forms of life. DNA consists of two long polymers of simple units called nucleotides, with backbones made of sugars and phosphate groups joined by ester bonds. […]

What organisms does the phylum Cnidaria include? Cnidariacorals, sea anemones, jellyfish, and relatives. The Phylum Cnidaria includes such diverse forms as jellyfish, hydra, sea anemones, and corals. Cnidarians are radially or biradially symmetric, a general type of symmetry believed primitive for eumetazoans. What class of phylum Cnidaria does the species of sea corals belong? Corals […]

What happens to damaged blood vessels? A penetrating injury can occur when a blood vessel is punctured, torn or severed. Either type of vascular trauma can cause the blood vessel to clot (thrombosis) and interrupt blood flow to an organ or extremity, or cause bleeding which can lead to life-threatening hemorrhage. What are three things […]

What biome is home lions? Savanna Biome Which biome is home to lions zebras giraffes and elephants? A biome where grasses, not trees, are the main plant life. There are two types of grasslands: Tropical grasslands (Savannah) and the Temperate grasslands. American Grasslands: Prairie dogs, foxes, small mammals, snakes, insects, various birds. African Grasslands: Elephants, […]

How do you keep your bones and muscles healthy? What can I do to keep my bones healthy? Include plenty of calcium in your diet. For adults ages 19 to 50 and men ages 51 to 70, the Recommended Dietary Allowance (RDA) is 1,000 milligrams (mg) of calcium a day. Pay attention to vitamin D. […]

What layer of rock are fossils found in? sedimentary rock What is a rock layer full of fossils called? The type of rocks in which dinosaur fossils (and almost all other fossils) are found is called sedimentary rock. Sedimentary rock generally occurs as flat layers called strata (single layers called stratum). What is it called […]

What are the different types of plant cells? Types of Plant Cell Parenchyma cells. Collenchyma cells. Sclerenchyma cells. Xylem cells. Phloem cells. Meristematic cells. Epidermal cells. How are plant cells similar and different? Structurally, plant and animal cells are very similar because they are both eukaryotic cells. They both contain membrane-bound organelles such as the […]

Which type of energy transformation occurs in photosynthesis quizlet? During photosynthesis, plants convert radiant energy into chemical energy. The amount of chemical energy produced is less than the amount of energy absorbed by the plant in the form of light. What type of energy is used in photosynthesis? Photosynthesis, the process by which green plants […]