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There are several differences between a physical and chemical change in matter or substances. A physical change in a substance doesn't change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed.

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plants need photosynthesis to live because the sunlight is used to synthesis foods from carbon dioxide and water.

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animals,plants,protists Monera and fungi.
animal=fox
plants=daisy
protists=amoeba
Monera=  archaebacteria
bacteria= strep throat

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population is a  particular section, group, or type of people or animals living in an area or country. symbiosis is a interaction between two different organisms living in close physical association, typically to the advantage of both. mutualism , commensalism parasitism are behavior or relationship between one another.

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The difference between weather and climate is that weather consists of the short-term (minutes to months) changes in the atmosphere. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure, as in high and low pressure.

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the cell theory is the basic units of structure and function in living organisms

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Heat can be transferred from one place to another by three methods: conduction in solids, convection of fluids (liquids or gases), and radiation through anything that will allow radiation to pass. The method used to transfer heat is usually the one that is the most efficient.

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All matter can be classified into two categories: pure substances and mixtures. A pure substance consists of a single element or compound. Iron is formed only of iron (Fe) atoms; table salt is formed only by sodium chloride (Na Cl) molecules. A mixture, however, is made up of different compounds and/or elements.

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cells are what make up organisms. They are also the smallest structural and functional unit of an organism, typically microscopic and consisting of cytoplasm and a nucleus enclosed in a membrane. Microscopic organisms typically consist of a single cell, which is either Eukaryota or prokaryotic.

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the water cycle  is a process of how water travels. precipitation,condensation,evaporation,transpiration and runoff are all ways that water travels

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The Rock Cycle is a group of changes. Igneous rock can change into sedimentary rock or into metamorphic rock. Sedimentary rock can change into metamorphic rock or into igneous rock. Metamorphic rock can change into igneous or sedimentary rock. Igneous rock forms when magma cools and makes crystals. weathering is breaking down. erosion is moving the broken pieces. deposition is  Wind, ice, and water, as well as sediment flowing via gravity, transport previously eroded sediment, which, at the loss of enough kinetic energy in the fluid, is deposited, building up layers of sediment.

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the basic unit of a chemical element

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Define primary and secondary succession 

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Define primary and secondary succession 

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Primary succession is one of two types of biological and ecological succession of plant life, occurring in an environment in which new substrate devoid of vegetation and other organisms usually lacking soil, such as a lava flow or area left from retreated glacier, is deposited.
As opposed to the first, primary succession,secondary succession is a process started by an event  that reduces an already established ecosystem

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A food web is a chain where organisms get energy from one another or like producers get energy by light.
A food chain shows how each living thing gets food, and how nutrients and energy are passed from creature to creature. Food chains begin with plant-life, and end with animal-life. Some animals eat plants, some animals eat other animals.
producer is a organism that makes their own food. a decomposer is to break down dead organisms or bacteria. a consumer is a organism that eats other organisms to get energy

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The control group is defined as the group in an experiment or study that does not receive treatment by the researchers and is then used as a benchmark to measure how the other tested subjects do.
An experimental group is the group in an experiment that receives the variable being tested. One variable is tested at a time.

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what is an independent and dependent variable?

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what is an independent and dependent variable?

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an independent variable is the one changed by the scientist in an experiment.
A dependent variable is the one that gets affect ed during the experiment

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a periodic table is a table that list all the elements and they are still adding more.

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the scientific method is a series of step from the observations and inferences. Also it is not always true. we use it because we have to do experiments in step and we also use by doing experiments step by step. That's how we analyze experiments.

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an inference is a reasoning or an answer to a question based on data.

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an observation is studying something and writing down data about the item. Also to get information.