Both A, B, and C are found in the excretory system.
Myofibrils are in the muscle of the intestines, villi increase surface area of the intestine, and nephrons help to filter in the kidney. Osteoblasts are found in bone, so therefore is not part of the excretory system
Answer:
There is two main kind of historical sources such as:
Primary sources, it may be oral or hand-written, it is generally which is originated in the past, it can be eye witness or chronicle or observer living during a particular historical era.
Secondary sources, on the other hand is the information gathered by someone who did not actively take part in or witness a historical event, secondary sources include such as articles, magazines, popular history textbooks, etc.
Explanation:
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1.) When a boy was skating, kinetic energy was high, and thermal energy was low.
2.) As the boy applied his brake pad, kinetic energy was decreasing and thermal energy was increasing.
3.) When the boy stopped, kinetic energy was low, and thermal energy was high.
4.) At all times, total energy = kinetic energy + thermal energy
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