Which of the following is a major force that moves water through the xylem tissues of a plant?

a. pressure-flow

b. transpiration pull

c. capillary action

d. both b and c

Many songbirds breed in North America in the spring and summer and then migrate to Central and South America in the fall.

The volume of a sphere increases with the cube of its radius. If the radius of a sphere increases from 2 cm to 6 cm. by what factor does its volume increase

Which molecule would be most affected by limited nitrogen?

Which of the following are characteristics of the outer planets? composed of gas and ice several moons more massive than inner planets atmospheres of mostly hydrogen and helium all of the above

How do beaver dams contribute to species diversity in an ecosystem?

What is a variable? A. A statement that explains a phenomena and can be tested. B. An educated guess used in an experiment. C. Something that must be kept constant in an experiment. D. A value or characteristic that can take different values.

Events that damage the cell's regulatory apparatus, trapping it in the G1 phase of the cell cycle, cause the uncontrolled division of cells called

What is incomplete dominace or codominance and its cause?

What is the functioning of cell membrane?

Why is the grass green and the sky blue?