Why do synergistic effects complicate dose-response analyses?

25 points i think it's a, am i correct

In order to survive all organisms must carry out

12 3 4 5 6 7 8 9 10 time remaining 29: 51 shondra is thinking of making payments for her laptop by setting up automatic withdrawals with the store. what must shondra consider before she decides to pay with automatic withdrawals? shondra should be sure she will remember to call the store each month to make the payment. shondra should check her credit history to be sure she has a good credit score. shondra should be sure she will have enough in her account to be able to make the monthly payments. shondra should consult with a credit counseling service. mark this and return