hich of the following traits evolved first in our lineage?Question 19Answera.Flat facesb.Large molarsc.Large brainsd.Bipedalism

The trait that evolved first in our lineage is d. Bipedalism. Here's a step-by-step explanation:

1. Bipedalism: This is the ability to walk on two legs. It's believed to be the first trait that evolved in our lineage, around 4-6 million years ago. This trait is seen in the earliest known hominins, like "Ardipithecus ramidus" and "Australopithecus afarensis (Lucy)".

2. Large Molars: These evolved later, around 2-3 million years ago, with the emergence of the genus "Paranthropus". They had larger molars for a diet that required heavy chewing.

3. Flat Faces: This trait is associated with the genus "Homo", which appeared around 2 million years ago. Flat faces are a characteristic of modern humans and our closest extinct relatives.

4. Large Brains: This trait evolved last, around 1-2 million years ago. Early hominins had small brains, similar in size to those of modern apes. The significant increase in brain size is seen in the genus "Homo", particularly in "Homo erectus" and later species.