What is the evolutionary significance of tissues, organs, and organ systems in animals?
What will be an ideal response?
Tissues allowed a specialization or division of labor amongst the growing number of cells in the animals. Because a single cell no longer had to do all life functions itself and instead could cooperate with neighbors, larger size was also a by-product of specialization. As organisms evolved larger body size, they had more cells that were further from the surface where nutrients and wastes could be exchanged. Systems such as the cardiovascular and respiratory systems developed to bring nutrients to these deeper cells and remove wastes from them. Large, complex animals would not be possible without such specialization.
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Yeast are
a. single-celled fungi. b. multicellular plants. c. single-celled plants. d. single-celled protists. e. multicellular fungi.
Sickle cell anemia is an example of
1.founder effect. 2.a genetic bottleneck. 3.heterozygote advantage. 4.genetic drift. 5.gene pools.
Which description applies to individuals who are well adapted for a particular environment?
A) They may or may not be equally fit in another environment. B) They are the best fit for all other environments. C) They are at a disadvantage in other environments. D) They will mutate to become fit in other environments.
mRNAs that lack an in-frame stop codon are degraded by the process of
a. nuclear surveillance. b. an miRNA decay pathway. c. nonsense-mediated decay (NMD). d. no-go decay (NGD). e. nonstop decay (NSD).