Along with an erect structure that enables us to walk on two legs, what is a feature that distinguishes the human skeleton from most other animals?
a. exoskeleton
b. four-chamber heart
c. four limbs
d. opposable thumbs

How did the miller-urey experiment impact the way scientists think about the origins of life? use what you know about the miller-urey experiments to discuss the factors needed for life to arise, and speculate on whether life could arise on another planet.

The image below shows a weather service map. which details best describe this map? check all that apply

Which of the following best describes the expensive tissue hypothesis? brains require more energy, so the gut had to be reduced, and larger brains and tool use led to higher quality diets. increasing body size means that homo neanderthalensis had to include more fat in its diet. brains require more energy, so the gut had to be reduced as brains got bigger. brains require more fat, so the gastrointestinal viscera (gut) had to expand, and hands were needed to acquire more food.