Which phrase best describes the effect of a catalyst on a chemical reaction? Select one: a. decreases the reaction rate b. decreases the activation energy c. increases the temperature d. increases the volume of reactants

Deacribe the process of melting

Gregory wants to make a hole in a flat piece of wood. He places object Y on the piece of wood, and then object X on top of it. He then pushes down while rotating object X. Which two simple machines is Gregory using to perform this task? A.

Define karyotype ...

When predators consume prey that contain a toxic material, such as mercury, they may end up with a high quantity of the material in their bodies that can affect their populations and public health if they are consumed.

What changes occur to your breathing and heart rate during exercise? Why do you think these changes occur?

In which part of body is not found sebaceous glands?

Which of the following accurately describes the angiosperm plant life cycle? A. The ovule develops into an anther. B. The anther produces eggs. C. The embryo develops into a seedling. D. The ovary is haploid.

Which resource is a nonrenewable resource? fresh water maple trees solar energy precious metal

The trace or remains of an organism that lived ago, most commonly preserved in sedimentary rock?

Usually flowers contain more stamens than pistil. Why?