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The skeletons of birds are lightweight and have air spaces in bones and fewer bones to aid in flight. 

Which of the below terms describe the process of reptiles losing their outer layer of skin? 

Snake venom is primarily composed of enzymes, proteins, and carbohydrates.

How do freshwater fish maintain water and ion concentrations? 

Which of the below features allows turtle shells to close? 

Match the below adaptation to how it benefits fish maintaining their position in the water: 

What is the function of the glottis in snakes? 

Match the type of mating relationship to its description:

Why do amphibians utilize moist areas to lay their eggs? 

organs are used to perceive chemicals in the air, similar to olfaction, while organs are used to detect temperature.