A scientist is at the hospital visiting a friend's young daughter, who has been
diagnosed with a respiratory virus. On his way out, he speaks with a nurse
and discovers that the pediatric wing of the hospital was recently converted
into a respiratory disease unit due to the recent rise in respiratory infection.
The scientist realizes that respiratory disease is a serious problem. The
scientist is in which part of the engineering process?
A. Making a plan
B. Doing the plan
C. Knowing the background
D. Identifying a need

D.

Explanation:

Identifying a need.

so she was walking and she stepped on warm jeffy , uh uh uhh dadye i just pooped my pants

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.