WIll MARK BRAINLIST PLZZ HELPN DUE IN 20 min Which are the two ways that scientists investigate the impact of limiting factors on a population? (Choose 2) Group of answer choices

researching climate change

scientific experiments

learning about molecular bonds

observational studies

In an experiment examining the effects tai chi on arthritis pain, callahan (2010) selected a large sample of individuals with doctor-diagnosed arthritis. half of the participants immediately began a tai chi course and the other half (the control group) waited 8 weeks before beginning. at the end of 8 weeks, the individuals who had experienced tai chi had less arthritis pain that those who had not participated in the course.

Amarine ecologist has constructed the conceptual model shown in the diagram. what predictions can be made from using this model? where the tertiary consumers get their energy how often primary producers are able to reproduce when bacteria and fungi initiate the process of decomposition whether other secondary consumers are present

Are gametes exactly the same? explain why or why not?