NAS2 Challenge Exam 2023 |121 QUESTIONS AND ANSWERS |ALREADY PASSED

Purpose of Scientific Method - ANSWER solve a problem or answer a question Question, Hypothesis, Experiment, Observe & Record, Analyze, Conclude - ANSWER steps of scientific method Independent variable - ANSWER a variable that stands alone and isn't changed by the other variables you are trying to measure, change or controlled example: age dependent variable - ANSWER a variable dependent on other factors, tested or measured example: test score - factors that go into a score you receive on a test control group - ANSWER does not receive treatment and used to compare or measure the other subjects experimental group - ANSWER exposed to changes in independent variable anatomy - ANSWER branch of science concerned with bodily structure of living organisms; structure physiology - ANSWER science dealing with the functions of living things or their organs level of organization - ANSWER living things arranged from the simplest to most complex are: organelle cells tissues organs organ systems, organism populations communities ecosystem biosphere requirements for life - ANSWER Cellular organization Reproduction Metabolism Homeostasis Heredity Response to stimuli Growth and development Adaptation through evolution survival needs - ANSWER Food, oxygen, water, body temperature, atmospheric pressure (oxygen/carbon dioxide exchange) homeostasis - ANSWER relatively constant internal physical and chemical conditions that organisms maintain receptor - ANSWER senses environmental stimulus and sends info to control center control center - ANSWER hypothalamus signals effector effector - ANSWER responds to stimuli example: muscle contracting negative feedback mechanisms - ANSWER net effect is that the original output of the system shuts off the original stimulus or reduces the intensity