Answer :
Question 1
Part A
Femtoplankton => 2 × 10^ -8 meter
Mesoplankton => 1 × 10^ 6 meter bigger than Femtoplankton
=> 1 x 10^ 6 x 2 x 10 ^ - 8
[tex]\begin{gathered} 1X10^6X2X10^{-8} \\ \\ 2X10^{6\text{ -8}} \\ \\ 2X10^{-2} \end{gathered}[/tex]The size of the Largest Mesoplankton is 2 x 10 ^ -2 meters
Part B
To apply the Associative Properties of multiplication
a x b = b x a
1 x 10^6
