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A food chain is a linear network of links in a food webstarting from producer organisms (such as grass or trees which use radiation from the Sun to make theirfood) and ending at apex predator species (like grizzly bears or killer whales), detritivores (like earthworms or woodlice), or decomposer species (such as ...

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In addition to the nucleus, eukaryotic cells may contain several other types of organelles, which may include mitochondria, chloroplasts, the endoplasmic reticulum, the Golgi apparatus, and lysosomes. ... Subsequently, the rest of the cell's organelles use this ATP as the source of the energy they need to operate.

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Prokaryotes are unicellular organisms that lack organelles or other internal membrane-bound structures . Therefore, they do not have a nucleus, but, instead, generally have a single chromosome: a piece of circular, double-stranded DNA located in an area of the cell called the nucleoid.

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Transpiration is the process by which plants lose water out of their leaves. Transpiration gives evaporation a bit of a hand in getting the water vapor back up into the air. Condensation: Water vapor in the air gets cold and changes back into liquid, forming clouds.

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Atoms are the basic units of matter and the defining structure of elements. Atoms are made up of three particles: protons, neutrons and electrons. Protons and neutrons are heavier than electrons and reside in the center of the atom, which is called the nucleus.

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The periodic table is a table/gragh arrangement of the chemical elements, ordered by their atomic number (number of protons), electron configurations, and recurring chemical properties.

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Experiments are one way to answer questions.  If your child asks you "How long does it take for an ice cube to melt?", the two of you can do an experiment to find out.  Take an ice cube out the freezer, put it in a bowl on the counter and time how long it takes to melt.  That's the simplest type of experiment where you are watching a phenomenon.

That basic experiment can lead to more questions and more advanced experiments.  After watching the ice cube melt, most kids will start to ask more questions.  What could we have done to make the ice cube melt faster?  What would make it melt slower?

One option at this point is to take a moment and create a hypothesisabout ice cubes and melting.  Another option is just to help your child set up a series of tests.

Whether you are creating a science fair project, using a hypothesis or just experiment for fun, let's define a few of the terms.

Independent variable - something that is changed in the experiment.

Dependent variable - something that responds to the Independent variable.

Constant Variable - something that is kept the same throughout the series of experiments.

Control - similar test where the independent variable is left unchanged to provide a comparison.

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the scientific method is a way for scientists to study and learn things.

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A variable is any factor, trait, or condition that can exist in differing amounts or types. An experiment usually has three kinds of variables: independent