1) Which of the following elements does NOT belongs to the alkaline earth metals? Select the correct answer below: calcium magnesium iron strontium ------------------------- 2

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1) Which of the following elements does NOT belongs to the alkaline earth metals?

Select the correct answer below:

calcium

magnesium

iron

strontium

-------------------------

2. In nature, how do phosphate ions become available for marine food webs?

Select all that apply:

• surface runoff
•  
• groundwater flow
•  
• river flow
•  
• precipitated sediments from the ocean floor