Answer:
D. threat; challenge
Explanation:
Anything that causes an organisms stress process to initiate is called a stressor.
Threat is something that can cause us harm or something which we perceive might cause us harm.
A challenge is a threat, if overcome can cause us to grow our personality.
So, a threat is something which we cannot overcome while a challenge is a threat which we perceive can overcome and will be beneficial for us.
Ok so let me explain this. <span>In the library of congress system of classifying books, every book receives a classification number that starts with 1-3 letters. Those letters give you a general idea of topic.</span><span> The "Teaching New Math" book It's in the Q's for sciences, and more specifically QA's under math. So the answer you will be looking for is QA. Hope this can help you</span>
Answer: vertical merger
Explanation: A vertical merger involves similar businesses that are involved in particular specialized needs. For example, US steel produces steel which is used in making automobiles. General motors needs steel to produce automobiles. A merger between these two Companies is termed a vertical merger. Another example can be a grocery store that sells chicken eggs purchasing a poultry farm that rears chicken.
By using the wheel, mankind gained the ability to work more efficiently and travel more quickly. Besides its use in transportation, the wheel went on to become the basic principle behind almost every mechanical device.
