A person is walking through a park. A branch from a tree falls, nearly hitting her. Her heartbeat speeds up. Which part of the nervous system was responsible for this?

A prolonged world-wide drought might A. change world human population. B. alter economic conditions. C. cause disease to spread. D. All of the above. E. None of the above. F. Both A and C.

The cholodny-went hypothesis has been proposed to explain how plants bend toward a directional light source. What does this hypothesis suggest?

How many double stranded chromosomes does mitosis start with?

Propane is burned to provide the heat in many cooking grills. The chemical reaction for this process is shown in the equation below. C3H8+5O2->3 CO2+4H2O+energy. What are the products in this chemical reaction?

A congenital heart defect in which there is an opening between the two atria is abbreviated as a (n)

8. What aspects of the experiment should Victor have held constant?

A tornado rips through the North Carolina mountains and destroys a huge forest. This decrease in the tree population is the result of a A) type of punctuated equilibrium. B) density dependent limiting factor. C) primary succession limiting factor.

What kingdom do eubacteria and eukaryotes belong to?

Bacteriophages are bacteria that engulf and destroy viruses

What important role do fungi play in the environment