D.3c: Human Evolution
24/09/2013 § 1 Comment
Hahahahaha, there is no reading involved in this particular blog because we read it for the last one??? What is going on with my life?
DATA BASED QUESTIONS
Page 320, cranial capacity and diet
a) Outline the relationship between cranial capacity and dietary energy. —> As evolution progresses and the cranial capacity (size of the skull) gets bigger with each hominid species, the percent of dietary energy also increases.
b) Suggest a reason for this relationship. —> The size of the skull can support a bigger brain, and a bigger brain requires more energy (so more meat instead of just vegetables).
a) Analysis of fossils suggests that there was an increased consumption in meat in the diet of hominids with time. State what kind of fossil evidence might show this. —> The evolution of the kind of teeth in hominids is the fossil evidence we have that show an increased consumption of meat.
b) Explain why this change to a more carnivorous diet might have been important in the evolution of humans. —> Firstly, the climate change of the hominid’s environment triggered a change in how they get their food. They switched from eating mostly plants to having to hunt meat and other animals in order to eat. The addition of meat in their diet gives them an increased supply of protein and other nutrients that the brain needs as energy to grow. A larger brain is often associated with more intelligence, which would ultimately help the hominid species to hunt better and survive.
a) State the relationship between relative diet quality and relative brain size. —> The higher the diet quality, the larger the size of the brain.
b) Suggest a reason for humans being above the trend line for this relationship. —> Primates mostly eat plants and humans eat basically anything but overall, humans’ diet quality is better in that we take in a larger variety of nutrients. Because of this, our brains are … you know. Bigger.