A difficulty in fossil comparisons is that the fossil may be from: a large plant or animal an old plant or animal an extinct plant or animal

an extinct plant or animal

Explanation:

Fossils of an animal or plant refers to its preserved or mineralized remains. Fossils have proven to be an integral part of tracing life back. Among the very many usefulness of keeping fossil records of plant and animals, one of them is discovering the evolutionary relationships between these organisms.

Fossils of plants or animals are compared with that of a present organism to discover how related they are. However, a difficulty that arises during this comparative procedure is that the fossils about to be compared may be from an extinct plant or animal.

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when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.