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❶You probably know that DNA contains the "instructions for life" and that our genes determine many of our characteristics. What is one key development that separates reptiles from amphibians?


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A very common chemical agent is nicotine, which is found in cigarettes and An absorbance versus concentration curve for CuSO4 is seen below. An unknown sample of CuSO4 was The question is incomplete without the absorbance vs.

Nonetheless, enough information will be provided to help you answer the question correctly What is the dye concentration in a solution when absorbance is 0. To solve this problem, we need to know the relationship between the absorbance at a particular wavelength and the concentration of the given dye. The dye concentration is measured typically in Find the resultant vector mag and dir given the following information: A two-dimensional vector is a geometrical object that can be given either as a magnitude and direction, or as two components.

When the two components are given, as in this problem, the magnitude Predict how a cell would be affected if the cell membrane had to many cholesterol molecules? Cholesterol is a lipid. It is a waxy, fat-like substance that is produced by the liver and can be obtained through eating certain foods. While it is an important part of a person's diet and overall Compare and contrast spiders and lizards. Similarities Spiders and lizards can live anywhere on the planet. The only exception is mountaintops or an extremely cold region such as Antarctica.

They mostly prefer habitats with dense To rephrase your question, I think you're asking "Why does immunization increase the speed and effectiveness of clearing an infection? What steps should a person follow to care for a horse's feet? To start with, you should always be sure to check a horse's hooves for rocks, nails, and other debris that can get stuck in the hoof or under the shoe.

Second, be sure to check the hoof itself for What is the unifying force in a beehive? The queen bee is understood to be the most important, unifying creature in a bee hive. She is usually the only mated bee in the hive and is the mother to most, if not all, bees within the hive. Biology is defined as either the science of life or the study of living things.

There are many disciplines which fall under the umbrella of biology. To name a few, these include botany the study What are four common methods used to discover exoplanets? There are many ways that exoplanets are discovered. Pulsar timing is a process in which radio waves emitted by pulsars are timed. Shifts in the timing indicate the presence of an exoplanet. In which state of matter does diffusion occur the fastest?? Diffusion happens in all states of matter, from solid to liquid to gas.

Diffusion occurs the quickest when matter is in its gaseous state. Diffusion is, quite simply, the movement of molecules from What is the role of intestinal juice in digestion? Intestinal juice is a part of the larger digestive system.

It is an integral part of digestion and is excreted into the small and large intestines when the body detects that there is food in the How do the skeletal and circulatory system work together? Our body is made up of eleven systems that work together to help our bodies function in harmony. These systems, often called organ systems, are made up of various organs within our bodies. Which part of the flower performs a similiar role to the testes in the male reproductive system?

The part of a flower that imitates the human male reproductive system is called the stamen, and the part that imitates the testes are the microspores on the anther. The stamen has two main parts Why are cell membranes said to have selective permeability? Selective permeability refers to the fact that membranes allow only certain substances to pass through and gain entry into the cell.

Other materials are not allowed access to the cell, and they are Which particle is most important to the identity of an atom? There are three main types of particles in atoms: Protons and neutrons are collectively referred to as "nucleons" because they both reside in the nucleus of the 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 Join Curious Kate to find out all about electricity and how we use it. Explore energy, forces and materials with KS1 and KS2 games. Learn about different ways to get energy, and try to 'catch' as much of it as you can.

Journey to Fossil Island to save a once-idyllic isle from pollution at the hands of the evil Baron Fossilosis. Get hands-on with kids' electronics sets and build your own circuits safely!

Visit an exciting new hydroelectric power station built inside a mountain in the Scottish Highlands. Learn more about hydropower at Rheidol power station in Wales. Find out more about nuclear power at Wylfa power station in Wales. Ask your teacher about arranging a field trip to a local power station.

Most power stations run tours for school groups. Learn how electricity is made. See what happens if something goes too close to a source of electricity. Learn how we can generate power from water. See how homes in cities get electricity. What would it be like to live without electricity? See how one village in Peru handles it, and compare it with another nearby village that has electricity. This house is using solar, wind and hydro power. Learn how a solar power plant works.

Access thousands of brilliant resources to help your child be the best they can be. What are electricity and power generation? Electricity can be generated using coal, gas, nuclear fuels, the wind or sunlight.

Electricity is normally generated in big buildings called power stations. This is called energy efficiency. Electricity first came into widespread use in the Victorian era , when people started to use it to light streets, shops and homes.

When electricity travels through you, it is called an electric shock. It can be very painful and can even kill people. A bolt of lightning is electricity travelling from the clouds to the ground, or from cloud to cloud. Some methods of generating electricity, like burning gas and coal, create greenhouse gases that cause climate change. People are trying to make more of our electricity in ways that are good for the environment , like using wind power or solar power.

Wind power generates electricity by using the wind to turn the big arms on a wind turbine. Solar power generates electricity by absorbing the heat and light from the sun in special panels.

Electricity has led to a lot of changes in our lives. Before electricity, if you wanted to light your house at night, you had to use candles, or lamps filled with oil or paraffin. In , the first electric streetlights in the world were put in London. In , Godalming in Surrey became the first town in the world to have an electricity supply that everybody in the town could use.

Lots of trains are powered by electricity. They either get it from a wire that runs over the tracks, or from a third rail.

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