Question

question 4
1 pts
how do scientists know that the hominid called \ardi\ is about 4.4 million years old?
by analyzing volcanic deposits below the layer containing ardi
by comparing ardis dna to human dna
by looking at ardis anatomy
by comparing the stone tools found in the same sediment as ardi to other stone tools of known age

Explanation:

Radiometric dating of volcanic deposits (such as using potassium - argon dating) can provide absolute age estimates. The layer containing Ardi is bracketed by volcanic deposits. By analyzing the volcanic deposits below (and above) the layer with Ardi, scientists can determine the age range of the sediment layer where Ardi was found. DNA degrades over time, and for a 4.4 - million - year - old specimen, DNA comparison (especially with human DNA for age determination) is not feasible. Looking at Ardi's anatomy can give information about its morphology, evolutionary relationships, etc., but not its absolute age. Comparing stone tools (which were not present in significant numbers in the Ardi - containing sediment in a way that would allow this method for a 4.4 - million - year - old age determination as precisely as radiometric dating of volcanic deposits) is not the main way for this age determination.

Answer:

by analyzing volcanic deposits below the layer containing Ardi