_____ occurs when an organism accumulates increasing amounts of a chemical pollutant in its tissues over the course of its lifetime.

_____ is a species that have a disproportionately large effect on community structure.

_____ is the process by which water flow removes nutrients from soil and carries them away.

Which of the following tissues make up the bulk of the plant?

True or False:  The vascular bundles in monocot stems are dispersed throughout the ground tissue?

_____ is the conversion of a grassland or woodland to desert.

Which province of the ocean refers to the open waters?

Biome distribution depends on _____.

A _____ is all the species that live in some region.

_____ is a species likely to become endangered in the near future.