Which of these describes an amphiarthrosis joint? A joint in the elbow that permits movement in one plane.
A joint in the ankle that allows rotational movement.
A joint at the base of the skull that permits flexion and extension of the neck.
A joint in the spine that is slightly movable and separated by cartilage.

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.