What is one hypothesis biologists have proposed to explain latitudinal gradients in species richness?

What is one hypothesis biologists have proposed to explain latitudinal gradients in species richness?

 In the ocean, the biomass of large predators (e.g., sharks and tuna) is much smaller than that of herbivorous animals (e.g., small fish and phytoplankton). This is because

Two communities each contain the same number of species. In one community, the major species are all present in approximately equal percentages. In the other, one species makes up more than 70 percent of the species, while all the others are divided among the remaining 30 percent. The two communities differ in their species _______.

Before the Industrial Revolution, the concentration of CO2 in Earth’s atmosphere was 265 parts per million (ppm). At the end of 2012, the concentration was 393 parts per million. Given the correlation of atmospheric CO2 concentration with global temperature rise, what does this change suggest about the global carbon budget?

Before the Industrial Revolution, the concentration of CO2 in Earth’s atmosphere was 265 parts per million (ppm). At the end of 2012, the concentration was 393 parts per million. Given the correlation of atmospheric CO2 concentration with global temperature rise, what does this change suggest about the global carbon budget?

The number of individuals in a population divided by the area that the population takes up is known as the _______ of the population.

The number of individuals in a population divided by the area that the population takes up is known as the _______ of the population.

Please use the following information to answer the two questions below.    In this experiment, Balanus was removed from the habitat shown on the left.

Based on what you have read about metapopulation dynamics in Edith’s checkerspot butterflies, which statement is most likely to be true?