The biome with the most diverse communities of organisms is the

Rainforest

Explanation:

Tropical forests is a type of phytogeographic domain characterized by receiving a large amount of rainfall and presenting high levels of biodiversity and evapotranspiration. These forests are considered the biome with the most diverse communities of organisms.

Rainforests are located in equatorial areas, ie near the equator line, and in areas near the tropics. It occurs on the American, African and Asian continents, but in Brazil they are called the Amazon Rainforest, Atlantic Forest, and some vegetation groups in the south of the country, such as the Araucaria Forest.

idk what the options are but

these is a strong electrostatic attraction between the ions hence a lot of energy is needed to overcome this attraction

this is why the boiling points are so high

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.