Enzymes are biological catalysts<span> that carry out thousands of chemical reactions, which occur in living cells. Enzymes are large protein molecules with specific three-dimensional structures. Each enzyme </span>catalyzes<span> a specific </span>reaction<span>, or specific type of </span>reaction<span>, that involves specific substrates.</span>
Unlike casts and molds, which create a replica of an organism's skeletal structure or full body impression, trace fossils provide information about an organism's activities. Trace fossils such as footprints or burrows can indicate how an organism moved.
Answer:
Birds, such as owls and eagles, have feathers and thin, hollow bones. Reptiles, such as snakes and lizards, have scaly skin and are ectothermic animals. Both possess a unique kind of egg called the amniotic egg.
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