Enzymes are proteins that speed up reactions by

A. providing an additional energy source

B. supplying additional molecules for the reaction

C. removing inhibitors that slow down reactions

D. lowering the amount of energy required

What is El Niño? What is La Nina? How do they differ? I need it for an assignment.

Plants are living organisms. a. True b. False

Examples of vascular and nonvascular

Which of the Following is an Example of Parasitism? A. Tree frogs using a tree to hide from predators B. Fleas living on a dog, making the dog ill C. Algae living on a sloth, giving it camouflage D. Two fish protecting each other from preditors

How does embryology supports the theory of evolution?

Where is the moving electric field that causes Earth's magnetic field? A.) earth surface B.) in space C.) earth mantel D.) earth core

Cost minimization is an appropriate strategy in which stage of the product life cycle? a. introduction b. growth c. adolescence d. decline e. retirement

How can a kidney transplant be carried out?

Two of the risk factors for Down's syndrome include which of the following? Options exposure to high temperatures increased age of female infectious hepatitis over exposure to sunlight

What is the main difference between the life cycles of members of phylum bryophyta and phylum pteridophyta?