Category: Physics

What is the O layer in soil? O HORIZON- This is the top layer of soil that is made up of living and decomposed materials like leaves, plants, and bugs. This layer is very thin and is usually pretty dark. A HORIZON- This is the layer that we call “topsoil” and it is located just […]

What are the stages of response by the immune system to infection? The normal immune response can be broken down into four main components: pathogen recognition by cells of the innate immune system, with cytokine release, complement activation and phagocytosis of antigens. the innate immune system triggers an acute inflammatory response to contain the infection. […]

What type of air pollution is most harmful? Of the six pollutants, particle pollution and ground-level ozone are the most widespread health threats. EPA calls these six pollutants “criteria” air pollutants because it regulates them by developing limits that are based on human health and/or environmental criteria. Learn more about criteria air pollutants. Which air […]

Why do rivers flow north to south? THE FACTS: Unless the land it totally flat, rivers of water run downhill. If the source of a river is at a higher elevation than the mouth, that river will run from the source to the mouth. However, if that (higher) source is to the south of the […]

What is prokaryotic cell give an example? Bacteria are examples of the prokaryotic cell type. An example is E. coli. In general, prokaryotic cells are those that do not have a membrane-bound nucleus. Besides bacteria, the cyanobacteria (blue-green algae) are a major group of prokaryotes. What are the two major types of eukaryotic cells? Eukaryotic […]

What is the world doing to stop global warming? For example, improvements to energy efficiency and vehicle fuel economy, increases in wind and solar power, biofuels from organic waste, setting a price on carbon, and protecting forests are all potent ways to reduce the amount of carbon dioxide and other gases trapping heat on the […]

How can you tell if a book is worth money? The easiest way to know how much your copy of a book is worth on the open market is to check on how much similar copies are currently being offered for. Fill out this form with enough information to get a list of comparable copies. […]

How do you stay safe on a bike? 10 Ways to Stay Safe While Cycling Wear a Helmet. Not all states require bicyclists to wear a helmet. Check Your Equipment Before You Ride. Wear Reflective Materials. Keep Your Hands on the Bike. Know Your Signals and Use Them. Limit Your Distractions. Ride As If You’re […]

What information on a pedigree can tell you whether a gene is on an autosome? What information on a pedigree can tell you whether a gene is on a autosome or not a sex chromosome? If in a pedigree, the occurrence of the disorder is 50/50 between females and males, then it shows that it […]

What happens when arteries contract? The constriction of arterioles increases resistance, which causes a decrease in blood flow to downstream capillaries and a larger decrease in blood pressure. Dilation of arterioles causes a decrease in resistance, increasing blood flow to downstream capillaries, and a smaller decrease in blood pressure. Which blood vessels carry blood away […]