input: OPTIONS:
- hormones
- vitamins
- catalysts
- enzymes Now, answer this question: Answer the following question given this paragraph: Acids and bases are important in living things because most enzymes can do their job only at a certain level of acidity. Cells secrete acids and bases to maintain the proper pH for enzymes to work. For example, every time you digest food, acids and bases are at work in your digestive system. Consider the acidic environment of the stomach. The acidic environment helps with the digestion of food. The enzyme pepsin, which helps break down proteins in the stomach can only function optimally in the low pH environment. The stomach secretes a strong acid that allows pepsin to work, and the stomach to do its job. However, when stomach contents enter the small intestine, the acid must be neutralized. This is because enzymes in the small intestine need a basic environment in order to work. An organ called the pancreas secretes a strong base into the small intestine, and this base neutralizes the acid. Q: Acids and bases are important in living things because what proteins typically can perform their job only at a certain level of acidity? A:
A:
output: enzymes

Answer the following question given this paragraph: Q: Receptor clustering happens when what binds to the receptors? A:

OPTIONS:
- enzymes
- lipid molecules
- carbohydrates
- fas molecules

Answer: fas molecules

Problem: OPTIONS:
- Lower it
- stable it
- Pollute
- raise it
Q: Answer the following question given this paragraph: Q: What do increasing greenhouse gas concentrations in the air do to the earth's temperature? A:
Answer: raise it

Problem:OPTIONS:
- to feed their offspring
- to store food
- for protection against predators
- to reach the nectar at the bottom of flowers

Answer the following question given this paragraph: dome-shaped plug of thick lava that cools near the vent of a volcano. Q: Why do hummingbirds have long narrow bills? A:
****
A: to reach the nectar at the bottom of flowers

Answer the following question given this paragraph: Facilitated diffusion is the diffusion of solutes through integral membrane transport proteins. Facilitated diffusion is a type of passive transport . Even though facilitated diffusion involves transport proteins (and is essentially a transport process), it can still be considered passive transport because the solute is moving down the concentration gradient, and no input of energy is required. Facilitated diffusion utilizes proteins known as uniporters. A uniporter can be either a channel protein or a carrier protein. Q: Because the solute is moving down the concentration gradient, and no input of energy is required, facilitated diffusion is considered what type of transport? A:
OPTIONS:
- active
- neutral
- adaptive
- passive
passive

Answer the following question given this paragraph: The oceans are most polluted along coasts. Why do you think that's the case? Of course, it's because most pollution enters the oceans from the land. Runoff and rivers carry the majority of pollution into the ocean. Many cities dump their wastewater , water mixed with waste, directly into coastal waters. In some parts of the world, raw sewage and trash may be thrown into the water ( Figure below ). Coastal water may become so polluted that people get sick if they swim in it or eat seafood from it. The polluted water may also kill fish and other ocean life. Q: Where are the oceans most polluted? A:
OPTIONS:
- in warmer waters
- on the ocean floor
- along reefs
- along coasts

Answer:
along coasts