All proteins have a primary structure. fibrous and globular proteins have a secondary structure: α helix or β pleated. globular proteins also have a tertiary structure due to interactions of amino acid side chains with water. most globular proteins, including hemoglobin also have a quaternary structure. which of these structures is due to h bonding between amino acid chains?

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

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the fossil record provides evidence of a common ancestor to many species.

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?