Which type of microscope is the most widely used and shows cells against a bright background?

Evidence of a chemical change includes A) change in size. B) change in color. C) change in shape. D) change in weight.

How and why are seeds dispersed?

What is true of diffusion?

During which step of mitosis do the chromatids line up in the middle of the cell? A. prophase B. telophase C. anaphase D. metaphase

J ohannes wants to know whether soil, water, or both are needed for plant growth. He chooses to conduct experiments on a willow tree for five years to answer his question. How can his experimental methods be changed to improve his experiment?

Which has characteristics similar to a scientific model? A. the Brooklyn Bridge B. a deep-sea submersible C. a toy train D. a planetary rover

Which cause contributed to both world war 1 and world war 2 (A) Competition For Increased Economic Power (B) Some Nations' Desire To Expand Territory (C) The Belief In A Superior Race (D) A Mission To Spread The Catholic Faith

Ali was conditioned to blink using an air puff and a tone. the experimenter then presented only the tone until the blink response disappeared. what is ali displaying?

How does the reproduction rate of bacteria affect the illmness that is cuased by it?

Kristyn is thrilled to hear she is expecting twins. her doctor informs her that the twins are dizygotic. what does this mean?