What is the basis for a three-kingdom and four-kingdom classification system? Why is the two-kingdom system rarely used today?

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.

if you look up in the top right corner you'll see your current profile picture, click than click "view profile" you'll be able to change it there.

just finished the test, the answer is d, greg is the least cost-effective because he charges the most for the project