The minimum amount of energy necessary for a chemical reaction to begin?

Water is drawn upward from the roots through plant tissue to the leaves by

Imagine that you travel back in time 600 million years and are looking at marine organisms. What types of skeletons would you observe in these creatures?

10. The magnetic force depends on ___ between a magnet and a magnetic object.

Which statement best describes energy of an ecosystem

Dry and moist cooking methods are sometimes combined. a. True b. False

Which of the following is a sterile part of a flower? my choices are: pistil stamen sepal none of the above

What is the name of the science tha deals with taking x-rays

How do proteins travel from the endoplasmic reticulum to the Golgi apparatus? A. A part of the endoplasmic reticulum pinches off, forming a transport vesicle. B. A protective coating around the protein transports it to the Golgi apparatus. C.

Shortly after the zygote is formed, it begins the processes of duplication and division. each resulting new cell has:

Which of these planets atmospheres would be most able to support a colony of humans