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Melatonin is a hormone primarily released by the pineal gland at night and has long been associated with control of the sleep–wake cycle. As a dietary supplement, melatonin is often used for the short-term treatment of insomnia.
Utilizing chapter 11 of the course text, section 11.5 and additional research resources, discuss advantages and disadvantages of melatonin used as a dietary supplement compared to chemical-based sleep aids. How is the body affected by each type of sleep aid?
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Darwin’s readings took him to a predictive theory of how species might change with time: what later thinkers have called microevolution.
Darwin’s philosophical worldview then took him beyond his evidence to a conviction that environmental constraints could create whole new structures and organisms. Soon Darwin’s theory of macroevolution replaced the Creator with an environment that could create solely by constraint.
According to Chapter 13 section 13.1 of the course text, define microevolution and macroevolution.
The Galapagos islands have a great diversity of landscapes – from lush vegetation to nearly barren lava fields yet the Galapagos Finches survive on each island. How can this be explained?
Using the varying bills of the Galapagos Finches in figure 13.3 and additional research, explain how microevolution is evidenced.