During a case, the parasitic worm Plagiorhynchus cylindraceus, that lives in the intestines of songbirds such as starling. They produce eggs that exit with the host feces, the feces are eaten by foraging pillbugs. The eggs hatch into a juvenile infective stage. Eventually, the infected pillbugs are eaten by birds and the life cycle continues. What will predict about these case given above?

#Question id: 4970

#Unit 11. Evolution and Behavior

If two continental land masses converge and are united, then the collision should cause

#Question id: 4971

#Unit 11. Evolution and Behavior

On the basis of their morphologies, how might Linnaeus have classified the Hawaiian silverswords?

#Question id: 4972

#Unit 11. Evolution and Behavior

Fossils of Lystrosaurus, a dicynodont therapsid, are most common in parts of modern-day South America, South Africa, Madagascar, India, South Australia, and Antarctica. It apparently lived in arid regions, and was mostly herbivorous. It originated during the mid-Permian period, survived the Permian extinction, and dwindled by the late Triassic, though there is evidence of a relict population in Australia during the Cretaceous. The dicynodonts had two large tusks, extending down from their upper jaws; the tusks were not used for food gathering, and in some species were limited to males. Food was gathered using an otherwise toothless beak. Judging from the fossil record, these pig-sized organisms were the most common mammal-like reptiles of the Permian. Anatomically, what was true of Lystrosaurus?

#Question id: 4973

#Unit 11. Evolution and Behavior

Fossils of Lystrosaurus, a dicynodont therapsid, are most common in parts of modern-day South America, South Africa, Madagascar, India, South Australia, and Antarctica. It apparently lived in arid regions, and was mostly herbivorous. It originated during the mid-Permian period, survived the Permian extinction, and dwindled by the late Triassic, though there is evidence of a relict population in Australia during the Cretaceous. The dicynodonts had two large tusks, extending down from their upper jaws; the tusks were not used for food gathering, and in some species were limited to males. Food was gathered using an otherwise toothless beak. Judging from the fossil record, these pig-sized organisms were the most common mammal-like reptiles of the Permian.Which of Lystrosaurusʹ features help explain why these organisms fossilized so abundantly?

I. the presence of hard parts, such as tusks

II. its herbivorous diet

III. its persistence across at least two geological eras

IV. its widespread geographic distribution

V. its mixture of reptilian and mammalian features

#Question id: 4974

#Unit 11. Evolution and Behavior

Which of these is the most likely explanation for the modern-day distribution of dicynodont fossils?

#Question id: 4975

#Unit 11. Evolution and Behavior

The observation that tusks were limited to males in several species, and were apparently not used in food-gathering, is evidence that the tusks probably