Susan is studying air pressure and makes a simple mercury barometer as shown below. She knows that air exerts pressure. More pressure on the surface of the mercury in the bowl will cause the...
The most realistic description of energy flow through an ecosystem is a food web that represents an interconnected series of food chains. In general, the greater the number of alternative channels through which energy...
Touch sensors of nerves adapt to some degree after they have been stimulated for a period of time. On the first touch, a very high impulse rate of nerve signals is sent to the...
The diagram above illustrates the feet of five species of birds. Each foot is particularly well adapted for a certain environment and lifestyle. Which animal would be found in an environment similar to that...
The human body’s endocrine system, which keeps the body in a healthy balance, consists of glands that release chemical substances called hormones into the bloodstream. The endocrine glands and the functions that they regulate...
Water on Earth is found in many places. It is found in the atmosphere, the ground, oceans, lakes, rivers, and in the polar ice caps. The continuous movement of water from the atmosphere to...
A food chain is a way of showing food relationships among a group of organisms that share an environment. The illustration at the left represents a freshwater food chain. What is most likely to...
Making bread involves a chemical reaction. A chemical reaction involves starting materials (the reactants) and the substances produced (the products). Which material is a product of this chemical reaction?A . yeastB . sugarC ....
Each year, approximately 200 million tons of municipal solid waste are generated in the United States. Incineration (burning), recycling, landfills, reduce-reuse, and composting are all possible ways to reduce the amount of waste in...
Our genes consist of DNA molecules. DNA fingerprinting allows the detection of DNA fragment patterns in different people. In this process, enzymes are used to "cut" a person’s DNA into pieces. The length of...
