4. what must be true about an index fossil whose absolute age is used as a reference for other fossils?
the absolute age of the index fossil is actually unknown.
the absolute age of the index fossil was determined only by relative dating.
the absolute age of the index fossil was determined by radioactive dating or another absolute method.
the index fossils must be the same age as the other fossils.

What would be an example of hypothesis for goldfish respiration lab

1. emigration the movement of people from one place to another 2. immigration a situation in which resources are being used up at a faster rate than they can be replenished 3. migration the leaving of one's homeland to settle in a new place 4. overpopulation the movement of people to a new country 5. sustainable development a situation in which the birth rate is not sufficient to replace the existing population 6. underpopulation the ability to meet current needs without reducing the ability to meet future needs 7. unsustainable development the increase in the population of a city 8. urbanization a situation in which the number of people exceeds the available natural resources in an area

Drag each tile to the correct location. match each trait that an organism displays to a reproductive strategy.