Which scenario would be most appropriate to study using a natural experiment? I. the effects of an herbicide on human health II. the influence of sleep on exam performance III. the effects of an earthquake on blood pressure * 4 points I only II only III only I and III

Based on your observations of porto alegre and houston, what would you conclude about the longest and shortest days for the two cities on opposite sides of the equator

Many of the houses have fireplaces that are 15% efficient and use 15 kg of wood to heat a room to 20 degrees celsius. wanting to reduce their ecological footprint, several of the homeowners are considering switching to woodstoves that are 75 percent efficient. if they do change to using a woodstove, how many kilograms of wood will they save per use?

How does a teaching certificate affect one's prospects for acquiring a job in the education field? a. teaching certificates are required in very few u.s. states, so acquiring one is generally not beneficial. b. most public and private schools require teaching certificates, so acquiring one is crucial in obtaining a teaching job. c. the acquisition of a teaching certificate generally does not affect one's job prospects as they are not usually required by schools. d. since teaching certificates are only required to teach early childhood development classes, one would have more options and be able to teach younger students.