Elements were grouped on their properties and behaviors, so hydrogen resides with the alkali metals in group 1 (1A) because it has only 1 valence electron, like the metals in that group.
Answer:
Density dependent factors include disease, competition, and predation. Density dependant factors can have either a positive or a negative correlation to population size
Explanation:
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<span>Sodium chloride is in her beaker </span>
Answer:
anthropogenic sources like landfills, agricultural activities,coal mining and combustion and some sources are natural ones