10. Which is true of unicellular organisms? A. They lack cells.
B. They all are eukaryotes.
C. They lack cell differentiation.

a

Explanation:

The answer is

B. They all are eukaryotes.

Hope it will help :)

answer; economic order quantity;

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.