What element is part of the Alkaline Earth Metals family and located on period 4 Potassium

Bromine

Calcium

Krypton

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Iwill give brainiest to first person who gets it ! what are 3 basic types of interactions we see in an ecosystem?

Fossils can only be formed when? if mud, silt or tar is in the area to preserve the fossil ierosion does not occur and allows the fossil to form oxygen and microorganisms cannot decay the bones the area is dry and does not contain mud or silt