What do the four major groups of organic compounds all have in common?
a they all contain carbon.
b they all contain nitrogen.
c they all contain water.
d they all contain carbon dioxide.

A. They all contain carbon.

Explanation:

carbohydrates- Carbon,Hydrogen, Oxygen 1:2:1

Lipids- Carbon, Hydrogen, and Oxygen

Protein- Carbon, Hydrogen, Oxygen and nitrogen

Nucleic Acid- Carbon, Hydrogen, Oxygen, nitrogen, and phosphorous

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.

if you know your abc's you should be able to get your answer or just use google