The species diversity of earth's biomes increases as one goes toward the equator so that tropical rainforests have more species than boreal forests. which of the following is not a reason for this increased diversity at the equator?
- the equator has greater amounts of solar energy and heat.
- glaciation events forced organisms toward tropical latitudes.
- equatorial regions have relatively stable climates.
- equatorial regions have more habitat specialists.

The hypothetical island country of gilder lies in the mediterranean sea off the coast of france. demographers have studied gilder for the past 50 years. at the beginning of the study, gilder had a population of 20 million. the demographers have measured birth and death numbers, as well as immigration and emigration numbers, as shown in the data table. from the data, calculate the population of gilder for each 10-year period by filling in the population (no) and population (nt) columns in the data table. use this formula to do your calculations: population size: nt = no + (b + i) – (d + e)initial population = 20,000,000