The thymus produces ________, a hormone that stimulates the maturation of specialized white blood cells called T cells
A) testosterone B) thyroxine C) ACTH D) thymosin E) insulin
D
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There are greenhouse gases other than CO2, including methane (CH4) and nitrous oxide (N2O), which have potential to influence changes in Earth's climate
Compare the graphs shown below measuring CO2 levels and N2O levels in the atmosphere between 1978 and 2010. CO2 plays a role in the carbon cycle, whereas N2O is a product of the nitrogen cycle. The latter results primarily from agricultural practices that utilize nitrogen-based fertilizers. Because N2O stays in the atmosphere for about 120 years before undergoing a biochemical conversion or being removed by a reservoir, the impact of one pound of N2O on the warming of Earth's atmosphere is over 300 times that of the equivalent amount of CO2 http://www.epa.gov http://www.epa.gov. Thus, it becomes important to understand atmospheric gas trends and take these results into account when making decisions about human activities detrimental to Earth's climate. Reference: Ref 25-6 While both graphs show an upward trend, N2O levels (right panel) do not oscillate annually like CO2 levels (left panel). What may account for this difference? Select all plausible choices. What will be an ideal response?
Which of the following is NOT an enzyme?
a. amylase b. bile c. lipase d. pepsin e. trypsin
The ________ zone of a rocky shoreline is submerged and exposed by tides daily
Fill in the blank(s) with correct word
The biologist who studies interactions at the community level investigates interactions among
A) ecosystems. B) organisms of more than one species. C) animals of one species. D) social animals (such as honey bees). E) organisms of one species.