Explain why phospholipids will spontaneously form a membrane when placed in an aquatic solution.

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.

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.

In the diagram below, which organelle is a ribosome, which combines amino acids and produces proteins? о