Hernoglobin is a protein that binds to oxygen. It is only produced by red blood cells and it allows blood to transport oxygen throughout the body.
What staternent does this information best demonstrate?
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The proteins produced by cells have structures that are related to their function.
Proteins in specialized cells are the result of the expression of particular genes.
Proteins with similar functions to those produced in humans can be found in other species.
Speciallzed cells that are grouped together and perform similar functions are called tissues.
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the trilobite is used as an index fossil for various geologic time periods as specific types of the trilobites were present in different geological time periods. they are a group of marine arthropods belonging to the class of trilobita.

explanation:

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.

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