Assessment Questions Answers

15 WGU C190 Introduction to Biology Pre- Assessment Questions & Answers 1.Which two characteristics are found in organism C? Choose two answers.- Answer Jaw and Lungs 2.Where is the ancestor of wolves and gorillas, but not frogs, depicted on this cladogram?Answer Point E 3.Which organism has neither bones nor a jaw?Answer Lamprey 4.Which two organisms have eggs with shells?Answer Birds ; Crocodilians 5.Which organisms have four limbs and produce amniotic eggs without shells?Answer Rodents and rabbits; Primates 6.Which species on the following cladogram has the most similar DNA se- quence to species E?Answer D 1 / 2

15 7.Largemouth bass have recently been introduced into ponds that previously did not contain any large, predatory fish. Which adaptation would help the existing population of small, prey species of fish avoid predation from the largemouth bass?Answer Faster average swim speed 8.Western spadefoot toads breed and deposit their fertilized eggs in small, often short-lived ponds. The tadpoles grow in the ponds for a period of time before undergoing a metamorphosis into an adult frog. One unusual characteristic of spadefoot tadpoles is the ability to change body form during development. Normally most tadpoles are herbivorous and feed on plant material. However, when conditions in the ponds suggest they are beginning to dry up (e.g., an increase in water temperature or concentration of organic waste), a small percentage of individuals in the population undergo a dramatic change in body form and habit and begin to eat their competitors.This ability is considered to be advantageous as it both reduces the number of competi- tors in the pond and speeds up the rate of development of the transformed tadpoles.If global climate change continues (as predicted) to increase the average temperature of habitats around the world, how would populations of spadefoot toads likely evolve in response to an increase in pond tempera- tures?Answer Spadefoot toads would likely evolve to have a higher percentage of toads become carnivorous.