Plants respond to changes in their environment. The growth of a plant in response to a stimulus is called a (n):

A: Hormone

B:Stimulus

C:Auxin

D:Tropism

Which of the following occurs after topsoil is washed away? deforestation desertification irrigation pollution

Suppose that rat liver expresses a protein called Yorfavase. This enzyme is composed of 192 amino acid residues, and thus the coding region of the yfg gene consists of 576 bp.

When organisms die, most of the nitrogen in their tissues is A. lost from the nitrogen cycle forever. B. converted directly into nitrogen gas. C. recycled by bacteria in the soil. D. released directly into the soil.

How do you think camels might be affected if they didn't have humps?

Which term represents the rate at which the position of an object changes? a. speed b. velocity c. momentum d. acceleration

Which of the following is an advantage of nuclear energy over fossil fuels? A. Eliminates the need for mining. B. Uses a renewable energy source. C. Releases less CO2 waste products. D. Releases more CO2 waste products.

A cell with 46 chromosomes inside itsnucleus goes through one round of mitosis and cytokinesis. How manychromosomes are inside each of the two resulting nuclei?

The theory that explains how the earths surface is made up of moving rocky plates is called: A. Supercontinent B. Plate tectonics C. Sea floor spreading D. Continental drift

10. Which of the following is an emerging dis- ease that was unknown 50 years ago? a. malaria b. dengue fever C. Lyme disease d. schistosomiasis

What are the agents for deposition