Ammonite is a species of shellfish that is used as an index fossil. It has a distinct spiral shell. Which statement most likely explains why other
species of shellfish that existed around the same period of time are not considered Index fossils?

Archaebacteria use for movement. celia flagella pili cell walls

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.

Math focus 4. calculate a map has index contours at 250 m, 500 m, and 750 m. what is the contour interval?