Which of the following lowers the activation energy of a reaction?

A) Catalyst

B) Lipids

C) Carbohydrates

D) Reaction

Which is not an example of matter and energy cycling through living things? A. Grass giving off oxygen B. Grass growing C. A rock resting on the ground a D. Cows eating grass

Are enzymes used up after they do there job

Why do the crystals in gneiss line up in bands

Which is most necessary for specialization among producers to take place?

Most mutation are random and minor True or False

If you looked at heart cells, would you expect to see a lot of mitochondria or only a few? Why?

Which of the below is TRUE regarding desertification? a. It is likely to happen in any type of climate b. It produces rich desert ecosystems c. It is not usually impacted by droughts or climate change d.

What is considered a pre existing medical condition?

Humans do not eat the algae directly from the ocean, so how can we still be affected by it?

In an effort to control the ongoing cholera epidemic affecting Haiti, health officials are considering the use of cholera vaccines. One difficulty they are facing is the limited vaccine supply.