Question

A new fossil is found, and scientists are debating whether it can be considered a part of the human genus Homo. What piece of evidence would best indicate that the fossil is human?
large jaw bone for muscle attachment

pelvic blades rotated inward

very long arms

thick rib cage

Answer 1

The answer is large jaw bone for muscle attachment.

Pelvic blades are rotated inward anyway, so it is not the right answer. Very long arms are characteristic of many other animals, as well as a thick rib cage is. This leaves a large jaw bone for muscle attachment as the right answer. This trait is an adaptation to eating large quantities of food.

Answer 2

The correct answer is:

large jaw bone for muscle attachment.

Pelvic blades are rotated inward anyway, so it is not the right answer. Very long arms are characteristic of many other animals, as well as a thick rib cage is. This leaves a large jaw bone for muscle attachment as the right answer. This trait is an adaptation to eating large quantities of food.

Explanation:

By analyzing the fossil record we can tell how long life has remained on Earth, and how different plants and animals are compared to each other. The mandible, lower jaw or jawbone is the biggest, greatest and lowest bone in the human face. It affects the lower jaw and holds the lower teeth in place. The mandible sits below the maxilla. It is the only movable bone of the skull.