Ancient Marine Animals: Uids

What era did Uids dominate marine environments?

• Mesozoic Era

• Paleozoic Era

• Cenozoic Era

• Precambrian Era

What material were the exoskeletons of Uids made of?

• Calcium carbonate

• Chitin

• Silica

• Keratin

How did the size diversity of Uids benefit them?

• It made them immune to predators

• It allowed them to fly

• It provided camouflage

• It gave them ecological versatility

What feature helped Uids in catching and maneuvering prey?

• Wings

• Fins

• Chicer

• Tentacles

During which periods were Uids likely the apex predators?

• Cretaceous and Paleogene

• Triassic and Jurassic

• Ovis and Saluan

• Devonian and Carboniferous

What evolutionary pressure led to the larger sizes of Uids?

• Pressure from jawed fish

• Competition with trilobites

• Predation by marine reptiles

• Climate change

What was a major factor in the decline of Uids?

• Inability to reproduce

• Loss of habitat

• Competition with jawed fish

• Lack of food

What event marked the end of Uids?

• Triassic-Jurassic extinction

• Ordovician-Silurian extinction

• Cretaceous-Paleogene extinction

• Permian-Triassic extinction

How did Uids impact the evolution of other marine life?

• By driving adaptations

• By providing food

• By creating habitats

• By reducing competition

What role did Uids play in marine ecosystems?

• As both predators and prey

• Only as prey

• Only as predators

• As decomposers