When conducting tests for the presence of a specific organic substance, it is very useful to include an Experiment control.
<h3>What are chemical changes?</h3>
A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these reactions. Chemical reactions are usually characterized by a change in colour, heat change, precipitate formation and evolution of bubbles.
Example: Oxidation of magnesium
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Answer:
Sand
Explanation:
Space, water, energy, and air are all needed for an organism to survive. Sand is just somewhere an organism could accustom to live in that environment.
Answer:
b?
Explanation:
all of them are a community because a community coonsists of different types of organisms working together in an envoirment
Answer:
Selective breeding
Explanation:
In order to get a dog that has specific desirable trait/s, then the owners of the dogs have to get involved. The involvement should be in the manner of only allowing dogs that have the same trait to breed between each other, but in no case to be allowed to breed with other dogs that do not posses that particular trait. In this way, the offspring will inherit the desirable trait from their parents, and if the selective breeding continues, then there will be a new dog type on the scene that will be unique by its trait/s.