Select the correct answer. Which question is testable?

4. how does a phospholipid behave in water? the phosphate head does not mix with water; the fatty acid tails do. the phosphate head and the fatty acid tails mix with water. the phosphate head and the fatty acid tails do not mix with water. the phosphate head mixes with water; the fatty acid tails do not.

The activity of the modern sample is 1.10 bq . how long does that measurement take?

Me the formula cacl2 represents the compound