Answer:
In other words, it is so old that it is difficult to imagine.
Explanation:
In this case, the simplest answer is the correct one. It's not about math or science; it's just what it is; the history of the universe is very hard to imagine because is humans haven't been in it for very long.
Answer:
Used to be considered the unknown value
The gerund in this sentence is "learning". A gerund is a verb form which is acting as a noun, in this case after the preposition "in".
Answer:
A. A signal phrase may appear before, in the middle, or after researched information you are sharing.
Explanation:
Signal phrases examples:
1. claim
2. assert
3. imply
4. suggest
5. dictum
5. posit
Phrases are group of words that doesn't have a complete thought unlike clauses that can stand alone since it has a subject and predicate whereas a phrase doesn't.
An adjective phrase is one type of phrase to describe a noun or pronoun subject in a sentence. Also is adverb clause.
Hope this was helpful