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The following questions refer to the paragraph below.
A sediment core is removed from the floor of an inland sea. The sea has been in existence, off and on, throughout the entire time that terrestrial life has existed. Researchers wish to locate and study the terrestrial organisms fossilized in this core. The core is illustrated as a vertical column, with the top of the column representing the most recent strata and the bottom representing the time when land was first colonized by life.
Figure 25.2
-Assuming the existence of fossilized markers for each of the following chemicals, what is the sequence in which they should be found in this sediment core, working from ancient sediments to recent sediments?
1) chitin coupled with protein
2) chlorophyll
3) bone
4) cellulose
Bilateral Animals
Animals that possess bilateral symmetry, having a body plan in which the left and right sides mirror each other.
Coelomic Fluid
A fluid found within the coelom, the body cavity of most animals, that serves various functions including circulation and the provision of a hydrostatic skeleton.
Mesoderm
The middle layer of an embryo in multicellular organisms, giving rise to muscles, bones, and the circulatory system among other structures.
Water-Vascular System
A network of hydraulic canals unique to echinoderms, such as starfish, used for locomotion, feeding, and respiration.
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