9)
a galaxy is composed primarily of old, low-mass stars. it seems to have a fairly well-defined shape. it has very little amounts of gas and dust and consequently very few star forming regions. what type of galaxy is this?
a) spiral galaxy
b) irregular galaxy
c) elliptical galaxy
d) barred-spiral galaxy

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.