I would say the correct answer is that has an undetermined answer.
If a subject has been thoroughly covered, then there is no need for this researcher to do it all over again. If it's impossible to answer, there is no need to try. If it can be answered easily, then it doesn't really require a research. This leaves us with the last option, because a researcher might want to try and determine the answer.
Mammals (Mammalia) are a class of vertebrate homeothermic amniotes (of "warm blood") that possess milk-producing mammary glands with which they feed the young. Most are viviparous (with the notable exception of the monotrematas: platypus and echidnas). A clear example of a mammal is man and his best friend, the dog.
This should not be included in the notes, because it is scientifically approved that mammals have the capacity to produce milk and give this food to their young, which is vital for humans or dogs as in the example
D. The American economy soared as a result of the war.
1. Germanic Consonant Shift
2. runic symbols
3. guttural
4. dialect
5. phonetic
6. orthography
B because it is anything but noble to push people out of their own land
