Catalysts will activation energy of a reaction.

a)decrease b)double c)freeze d)increase

A catalyst is a substance that speeds up a chemical reaction. Catalysts will decrease activation energy of a reaction. Correct A

Adding a catalyst in a chemical reaction provides an alternative route for the reaction and has the effect of shifting the activation energy. However at the end of the reaction the catalyst is chemically unchanged

satellites are frequently used to make observations of the orbit on earth

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above