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Every 10 years, a census is taken in the U.S. by the Census Bureau. Despite the intent of gathering data on the population of the United States, issues exist that make true population data impossible to gather. Identify at least two issues in collecting these data.
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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