Five examples of questions:
Dost thou know who made thee? (from "The Lamb")
Little Lamb who made thee? (from "The Lamb")
What immortal hand or eye, Could frame thy fearful symmetry? (From "The Tyger")
In what distant deeps or skies,/ Burnt the fire of thine eyes? (from "The Tyger")
On what wings dare he aspire?/ What the hand, dare seize the fire? (from "The Tyger")
The tone of "The Lamb" is quiet. It asks the questions in a polite and gentle way. It is beautiful and innicent. On the opposite side, "The Tyger" has a tone full of fear and force.
Answer:
The first one: "Although both are elephants, Asian and African elephants are different in size, genetics, and habitat." is better because the thesis statement is supposed to be an introduction to your essay.
Explanation:
Meaning that it introduces the audience to the different topics that you're going to later bring up in the body paragraphs.
Think of the thesis as the entire purpose of your essay being condensed into one sentence.
Hope this helps you :)