Muscular tissues or cells expand and contract to move the body
<span>cells are the units of structure and different functions in livings things
</span>
Answer:
2
Explanation:
Fats are the slowest source of energy but the most energy-efficient form of food. Each gram of fat supplies the body with about 9 calories, more than twice that supplied by proteins or carbohydrates.
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I believe it is gene sex chromosones...
Density-Dependent Factors. Which is a limiting factor that depends on population size.