Which of the following is made up of smaller parts that are too small to be seen without a powerful microscope?

An atom. (If it's asking for the smallest part of the body)

Explanation:

The atom is the smallest cell in the body.

i think its white blood cells

i hope this

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.