Answer the following question given this paragraph: Bacteria provide vital ecosystem services. They are important decomposers. They are also needed for the carbon and nitrogen cycles. There are billions of bacteria inside the human intestines. They help digest food, make vitamins, and play other important roles. Humans also use bacteria in many other ways, including:. Q: These microorganisms are abundant in the human digestive track and serve many roles. what are they? A:

OPTIONS:
- antioxidants
- pathogens
- tumors
- bacteria

Answer: bacteria

Problem: OPTIONS:
- when the wind changes direction
- when the snow melts the ice caps
- when the ice and sand change directly into water vapors
- when the ice and snow change directly into water vapors
Q: Answer the following question given this paragraph: Sublimation occurs when ice and snow change directly to water vapor. This also happens because of heat from the sun. Q: When does sublimation occur? A:
Answer: when the ice and snow change directly into water vapors

Problem:OPTIONS:
- air
- water
- food
- light

Answer the following question given this paragraph: 8.2 | The Light-Dependent Reactions of Photosynthesis By the end of this section, you will be able to: Explain how plants absorb energy from sunlight Describe short and long wavelengths of light Describe how and where photosynthesis takes place within a plant How can light be used to make food? When a person turns on a lamp, electrical energy becomes light energy. Like all other forms of kinetic energy, light can travel, change form, and be harnessed to do work. In the case of photosynthesis, light energy is converted into chemical energy, which photoautotrophs use to build carbohydrate molecules (Figure 8.9). However, autotrophs only use a few specific components of sunlight. Q: Photosynthesis involves reactions that are dependent on what? A:
****
A: light

Answer the following question given this paragraph: All living thingseven the simplest life formshave a complex chemistry. Living things consist of large, complex molecules, and they also undergo many complicated chemical changes to stay alive. Thousands (or more) of these chemical reactions occur in each cell at any given moment. Metabolism is the accumulated total of all the biochemical reactions occurring in a cell or organism. Complex chemistry is needed to carry out all the functions of life. Q: What is the accumulated total of all the biochemical reactions occurring in a cell or organism called? A:
OPTIONS:
- respiration
- expansion
- circulation
- metabolism
metabolism

Answer the following question given this paragraph: Q: Unstable isotopes give off particles and energy as what? A:
OPTIONS:
- electricity
- radiation
- ultraviolet light
- radioactivity

Answer: radioactivity

input with options: Answer the following question given this paragraph: The first vertebrates evolved about 550 million years ago. The evolution of amphibians, reptiles, mammals, and birds occurred over the next 400 million years. The first vertebrates were ectotherms; endothermy evolved later. Modern fish, amphibians, and reptiles are ectotherms. Modern birds and mammals are endotherms. Q: Vertebrates differ from invertebrates because they lack this? A:
OPTIONS:
- legs
- head
- neck
- backbone or a spinal column
output:
backbone or a spinal column