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A National Parkway is a designation for a protected area in the United States given to scenic roadways with a protected corridor of surrounding parkland. National Parkways often connect cultural or historic sites. [1] The U.S. National Park Service manages the parkways.
The Official Units of the National Park System of the United States is the collection of physical properties owned or administered by the National Park Service. As of December 2024, there are 433 official units of the National Park System ; [ 1 ] however, this number can be misleading.
Advanced Placement (AP) Environmental Science (also known as APES, AP Enviro, AP Environmental, AP Environment, or AP EnviroSci) is a course and exam offered by the American College Board as part of the Advanced Placement Program to high school students interested in the environmental and natural sciences. AP Environmental Science was first ...
Fourteen national parks are designated UNESCO World Heritage Sites (WHS), [6] and 21 national parks are named UNESCO Biosphere Reserves (BR), [7] with eight national parks in both programs. Thirty states have national parks, as do the territories of American Samoa and the U.S. Virgin Islands.
One 2014 study of math and science AP courses showed that participation rates were 52.7% for AP Chemistry, 53.6% for AP Physics, 57.7% for AP Biology, and 77.4% for AP Calculus. [67] A 2017 study found similar participation rates (49.5% for AP Chemistry, 52.3% for AP Physics, 54.5% for Biology, and 68.9% for Calculus).
AP exams (with few exceptions [1]) have a multiple-choice section and a free-response section. AP Studio Art requires students to submit a portfolio for review. AP Computer Science Principles requires students to complete the Create task, which is part of the AP grade for the class. AP exams were taken by subject in 2013.
environmental science - the study of interactions among physical, chemical, and biological components of the environment. epidemiology - the study of factors affecting the health and illness of populations, and serves as the foundation and logic of interventions made in the interest of public health and preventive medicine.
CED-9 encodes the apoptosis regulator CED-9 protein which is an important negative regulator protein in the apoptosis pathway of C. elegans. [9] The protein consists of 280 amino acids and has a molecular weight of 31824.42 Da. [ 10 ] The structure of this protein has been solved using X-ray diffraction revealing 9 Helices , 2 Beta strands ...