Which type of stimulus is an allergen, such as pollen?

A.

inborn stimulus

B.

external stimulus

C.

response to a stimulus

D.

internal stimulus

Ken enjoys bird watching. Every summer, he sees many ruby-throated hummingbirds in his garden. However, during the winter, he never sees any ruby-throated hummingbirds.

You are researching a population of moles. In the course of your research, you identify a nearby population that occasionally comes into contact with your study population. What best describes the evolutionary process at work? A. Mutation B.

5. After a cell was treated with a certain chemical, the ribosomes stopped functioning. Which cell activity was immediately affected by this change in ribosome function?

Some cells possess the capacity to differentiate into various types of cells. What are these cells known as? A. egg cells B. nerve cells C. sperm cells D. stem cells

What is not an example of diffusion

Cell engulfs microorganisms in cell "eating": pinocytosis active transport phagocytosis passive diffusion facilitated diffusion

Which kind of organism is an autotroph? consumer producer decomposer herbivore

Which process connects glycolysis and the citric acid cycle?

Reform movements of the 1800's was most likely influenced by what event in Europe? A. Governments were slow to act. B. Populations were increasing rapidly. C. Revolutions were spreading across Europe. D.

What's the definition of chemical energy