All controlled experiments would have only one variable. If there were more than one variable the outcome of your experiment could be for multiple reasons and thus you would not be able to test whether your specific hypothesis was valid.
Answer: Exercise causes the heart to pump blood into the circulation more efficiently as a result of more forceful and efficient myocardial contractions, increased perfusion of tissues and organs with blood, and increased oxygen delivery. Aerobic exercise trains the heart to become more efficient.
Explanation:
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A fish with gills,
A leopard with spots
A bird with its feathers
Kidneys filter the extra water plus toxic materials in our blood. The help maintains homeostasis by keeping the level of toxin down.
Answer:
9 normal : 3 striped : 3 spotted : 1 striped and spotted
Explanation:
