How do you know which layer of rock is the oldest? The principle of superposition states that the oldest sedimentary rock units are at the bottom, and the youngest are at the top. Based on this, layer C is oldest, followed by B and A. So the full sequence of events is as follows: Layer […]

What are the advantages of coal oil and natural gas? Some clear advantages to natural gas are as follows: Natural gas is environmentally friendly because it burns cleaner than other fossil fuels. It’s safer and easier to store when compared to other fossil fuels. Natural gas is extremely reliable, unlike electric power that can be […]

What is the meaning of all living organisms are composed of cells? The unified cell theory states that: all living things are composed of one or more cells; the cell is the basic unit of life; and new cells arise from existing cells. Rudolf Virchow later made important contributions to this theory. The cell is […]

What electrode should be at the top when setting up your gel chamber? The anode (+ electrode) must be connected to the bottom chamber and the cathode to the top chamber. The negatively-charged proteins will move toward the anode, of course. Gels are usually run at a voltage that will run the tracking dye to […]

Why is basalt The type of lava that forms shield volcanoes? Shield volcanoes are formed by lava flows of low viscosity – lava that flows easily. Consequently, a volcanic mountain having a broad profile is built up over time by flow after flow of relatively fluid basaltic lava issuing from vents or fissures on the […]

How many chromosomes do the 4 daughter cells have after meiosis? A human cell has 46 total or 23 pairs of chromosomes. Following mitosis, the daughter cells would each have a total of ______ chromosomes….Problem 1: Number of chromosomes. A. 46, 46, 46 D. 46, 12, 12 How many chromosomes would the cells have after […]

What is the study of wavelengths of light called? In this sense, gamma rays, X-rays, microwaves and radio waves are also light. Like all types of electromagnetic radiation, visible light propagates as waves. The study of light, known as optics, is an important research area in modern physics. What waves are used in photography? Source, […]

What type of muscle is found only in the heart? Cardiac muscle cells are located in the walls of the heart, appear striated, and are under involuntary control. Smooth muscle fibers are located in walls of hollow visceral organs, except the heart, appear spindle-shaped, and are also under involuntary control. What type of muscles are […]

What do the inner planets Mercury Venus Earth and Mars have in common? The four planets closest to the sun—Mercury, Venus, Earth and Mars—are the inner planets, also called the terrestrial planets because they are similar to Earth. All of the inner planets are solid, dense, rocky planets. The inner planets either do not have […]

What are the basic needs of all cells of the human body? In order to survive, cells must satisfy some basic needs such as oxygen, water, nutrients, waste removal, and maintaining of homeostasis. Oxygen and nutrients are necessary for different processes inside the cell. For instance, cellular respiration uses glucose and oxygen to form energy […]