Answer:
The answer is option C : a bacterium
Definite article is used before a noun (person place or thing) to indicate that the identity of the noun is known to the reader.
indefinite article is used before a noun that is general or when its identity is not known.
Answer:
Neanderthals
Explanation:
Homo sapiens encountered neanderthals in europe and had offspring.
The increased temperature melts glaciers, ice caps etc. and thus increases the sea levels
