Th correct answer would be D! Hope this helps
Answer:
an experiment
Explanation: Any experiment you do to benefit the world in the name of science
When focusing a specimen you should always start with the SCANNING objective. Scanning objective is used to put the object you want to examine in focus. After proper focusing on the object, you can now switch to power objective.
Well, it’s just because nucleotides do not contain an amino group. Nucleotides are composed of nitrogen base bonded to a sugar which is also bonded to a phosphate group. No amino groups in sight.