Final answer:
32-bit systems use 4-byte words, and 64-bit systems use 8-byte words. The unit for one million bytes in computer memory terminology is called a Megabyte (MB).
Step-by-step explanation:
32-bit systems work with 4-byte words, and 64-bit systems work with 8-byte words. In computer architecture, the term 'bit' refers to the basic unit of information storage, which can either be a 0 or a 1. A 'byte' consists of 8 bits. Therefore, a 32-bit system processes data in 32 bits at a time which is equal to 4 bytes (as 32 divided by 8 equals 4). Similarly, a 64-bit system processes 64 bits of data at a time, which is 8 bytes (64 divided by 8 equals 8).
Referring to the multiplicative prefixes used for units in computer memory, the unit for one million bytes is called a Megabyte (MB). It's worth noting that in some contexts, a Megabyte is considered to be 1,024 x 1,024 bytes (which is 2 to the power of 20, or 1,048,576 bytes), as the computer industry often uses binary prefixes instead of decimal. However, for simplicity and common usage, 'one million bytes' is an acceptable definition for a Megabyte.