3. Which of the following statements is true about the worm phyla? Annelida and Nematoda phyla are the simplest of all worms while Platyhelminthes are complex worms

most annelids are free-living animals, but most flatworms and roundworms are parasites

Annelida, Platyhelminthes, and Nematoda all have animals with a coelom

many annelids are parasites, but flatworms and roundworms help fertilize the soil

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

Which was not a reason why canals were built in florida

When an object is moving away from you while still making a sound, the pitch of the sound is perceived to a. lower b. unchanged c. fluctuating d. higher