I think it is the third one
I think that in this passage the phrase "pack through" means carrying one's belongings on saddle packs on the horses and leaving the wagons (covered wagons?) behind to travel faster to get to the California gold fields sooner. Mr Johnson decided not to travel this way and instead harnessed his horse to the Frink's wagon and they continued as before. The following excerpt intimates what "pack through" means without actually saying it in those many words. "<span>Mr. Wand and his company have left their wagons here and made pack-saddles, intending to pack their clothing, blankets, provisions, and cooking utensils on their animals, in order to travel faster".</span>
"Derm" = skin.
So, when you are going into this field to practice skin diseases and treatment, the word you're looking for is a <u><em>dermatologist. </em></u>
A dermatologist <em>is a special doctor that manages diseases within the skin, hair, and nails. </em>
Essay writing is given to students in order to test their writing, reading skills, and knowledge on a topic.
<h3>How to write an essay?</h3>
Based on the information given, the way to write the essay will be given. Firstly, it's important to decide on your topic.
Research should be done on the topic and create an essay outline. Set your argument in the introduction and develop it with evidence.
Finally, check the content, grammar, formatting, and spelling, of your essay.
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