18 ) The efficiency of the machine with output is=30 N and input of 10 N= O 3
O 3%
30 %
O 0.33%

a. they must be certified by the avma.

explanation:

mark brainliest and have a great day!

indium, and thallium have three electrons i think

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.