Which of the following best describes an intimate ecological association in which an organism benefits from living on or within a host, but which generally has a negative effect on that host?

This biome can be recognized by its coniferous forests and relatively infertile, acidic soil.

Contains hydrolytic enzymes associated with the intracellular digestion of macromolecules

Individuals of a particular species of ground beetle are either light tan or dark brown. Light-tan beetles are predominant in habitats with light-colored sandy soils, and dark brown beetles are predominant in habitats with dark-colored loam soils. In an experiment designed to determine the survival rates of light-tan beetles and dark brown beetles in different habitats, 500 light-tan beetles and 500 dark-brown beetles were released in each of four habitats. Each beetle had been marked with a small spot of red paint on the underside of its abdomen before it was released. One week after the beetles had been released, any marked beetles that could be found were recaptured. The results are presented in the table below. It is assumed that differences in the numbers of beetles recaptured are directly related to differences in survival rates. Which of the following processes best explains why fewer light-tan beetles than dark-brown beetles were recaptured in habitat 4?

Each set of lettered choices below refers to the numbered words or statements immediately following it. Select the one lettered choice that best fits each word or statement. A choice may be used once, more than once, or not at all in each set.Which species would most likely represent humans if they were part of this ecosystem?

Which of the following best describes an intimate ecological association in which an organism benefits from living on or within a host, but which generally has a negative effect on that host?

A large population of laboratory animals has been allowed to breed randomly for a number of generations. After several generations, 49 percent of the animals display a recessive trait (bb), the same percentage as at the beginning of the breeding program. The rest of the animals show the dominant phenotype, with heterozygotes indistinguishable from the homozygous dominants. What is the most reasonable conclusion that can be drawn from the fact that the frequency of allele b has not changed over time?

This question refers to the data presented in the graph below of tobacco cells grown in tissue culture. The numbers on the curves indicate the concentrations of indoleacetic acid (IAA) in milligrams per liter. The purpose of the experiment above is primarily to determine the

The movement of water through vascular plants is important to their survival. Explain the mechanism of water movement through vascular plants during transpiration. Include a discussion of how the anatomy of vascular plants and the properties of water contribute to this process. Explain how gas exchange affects transpiration. Describe TWO adaptations that affect the rate of transpiration in desert plants.

The bones of a human arm are homologous to structures in all of the following EXCEPT a