What is a "falling star"?

A a comet entering Earth's atmosphere and burning up

B a meteor entering Earth's atmosphere and burning up

C a dying star

D a meteorite that has fallen to earth

Which two factors are most commonly used to classify climates? temperature and rainfall precipitation and humidity humidity and wind speed

An example of internal feedback working to maintain homeostasis is your A. decreased respiration rate when you are studying B. decreased heart rate when you are sad C. increased respiration rate when your muscles need more oxygen D.

Which theory did the study of cosmic background radiation disprove? A. the big bang theory B. the steady state model C. the big chill model D. the big rip model E. the big crunch theory

What are citrus fruits?

An important species of the Chesapeake Bay community is the Virginia oyster. The larvae of these oysters settle on top of mature oysters, forming large oyster reefs.

A scientific name has to refer to what

The changes in the surrounding environment can have an effect on plants too for a few weeks on the autumn season normally green leaves of deciduous plants acquire a red to yellow color how and why does this change in color happen?

Many of the biochemical reactions that occur within cells are catalyzed by enzymes. Which of the following statements is true about most enzyme-assisted reactions?

A cheeseburger from a fast food restaurant contains 19 g of fat, 20 g of carbohydrate, and 28 g of protein. How many kcal of energy does the cheeseburger contain

How do enzymes catalyze chemical reactions (don't just say "they lower the activation energy", give me specific mechanisms) ?