Final answer:
To write the amount of plankton in standard notation, move the decimal point 4 places to the right from the given scientific notation. The answer is 63,000 pounds.
Step-by-step explanation:
To write the amount of plankton in standard notation, we need to convert the given number from scientific notation to decimal notation. The given number is 6.3 x 10^4 pounds. To convert it to decimal notation, we need to move the decimal point 4 places to the right since the exponent is positive. This gives us a decimal notation of 63,000 pounds. Therefore, the correct answer is A) 63,000 pounds.