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One of the earliest atomic models was suggested by John Dalton. Which statement best reflects his The correct answer choice is d: Dalton proposed that atoms are indivisible and indestructible What physical property of a cork allows it to float on water? Density is the physical property that allows a cork to float on water.

Briefly, cork is less dense than the water. In other words, it is lighter than water and, hence, it floats on the water What role should science play in environmental decision-making?

Scientists are the experts on environmental issues. Often times, environmental problems are brought into the political arena from the science community. However, the information provided by the Calculate the entropy change for the reaction: The entropy change for the given reaction, involving the manufacturing of ammonia from nitrogen and hydrogen, can be calculated as the difference between the entropy of the products and reactants Is fire a solid, liquid, or gas?

Fire is not a solid, liquid, or gas; rather, it is a chemical reaction called a combustion reaction, or combustion. Combustion happens when there is the right mix of ingredients that work together Who made the first plane? The first successful airplane was invented by Wilbur and Orville Wright, also known as the Wright brothers.

Having created a successful glider in , the brothers dedicated their attention to the How do you prepare for and mitigate the damage caused by a tornado? Before a tornado hits, you want to familiarize yourself with emergency warning systems used in your community. Make note of disaster risks in your area, like damaged household gas lines and poorly What does the bible say about temptation, and how does it relate to stimuli control?

In the book of Corinthians, Saul talks about temptation. He claims that God allows people to face temptations that they can overcome. According to the Bible, there is always a way of resisting Do you think there is life, intelligent or otherwise, that exists on an exoplanet somewhere in I do think life probably exists on another planet. There are hundreds of billions of planets in the universe, and it seems against all the odds of probability that the Earth is the only one of them What is the name of the structures that pulls a heart valve open and shut?

The heart is a muscular structure whose purpose is to pump blood through the body. The heart valves serve to direct the flow of blood in one direction, and they are made of sheets of connective What is the name of the structures that pull a valve open and shut? In the most generalized notion of a mechanical valve system, the open and shut operations are controlled by oblong lobes, called cams, that rotate on the axis of a connected shaft, called the What are the types of acceleration?

Acceleration is defined as a rate of change of the velocity of a moving object: When an object moves What is the difference between mitochondria and plastids? A plastid is not necessarily a specific cell organelle in the way that a mitochondrion is. A plastid is a category of organelle. A chloroplast would be a specific type of plastid, but not all What happens when copper is treated with dilute HCl? Questions of this kind typically require you to identify the type of reaction that could potentially occur, then use published reference material on that type of reaction to determine whether the What is the difference between the skin of animals living in cold regions and the skin of those Animals that live in extreme climates have physical characteristics that help them survive in harsh environments.

Their skin, as well as their fur or feathers, serves as an insulator and thus acts Give any two uses of folic acid. Folic acid is a form of the water soluble B vitamin.

It can be found in foods such as dried beans, oranges, peas, lentils, various whole wheat products bread, pasta, etc. What would be the consequence of hemoglobin deficiency in our body?

Hemoglobin is a protein that carries oxygen throughout the body. The protein is found in red blood cells, and the amount of hemoglobin from person to person is variable. There are several ways of studying it: Science is versatile as it includes an overwhelming variety of disciplines, so everyone can find something they are interested in. People loving outer space will enjoy astronomy.

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