Q: Answer the following question given this paragraph: CHAPTER SUMMARY 4.1 Studying Cells A cell is the smallest unit of life. Most cells are so tiny that they cannot be seen with the naked eye. Therefore, scientists use microscopes to study cells. Electron microscopes provide higher magnification, higher resolution, and more detail than. Q: What is considered the smallest unit of life? A: | OPTIONS:
- proteins
- particle
- molecule
- cell
A: cell

Q: Answer the following question given this paragraph: The thyroid gland is a large gland in the neck. Thyroid hormones increase the rate of metabolism in cells throughout the body. They control how quickly cells use energy and make proteins. Q: Hormones produced by what gland in the neck increase the rate of metabolism in cells throughout the body? A: | OPTIONS:
- pituitary
- kidney
- thymus
- thyroid
A: thyroid

Q: Answer the following question given this paragraph: Science rests on evidence and logic, so it deals only with things that can be observed. An observation is anything that is detected either through human senses or with instruments and measuring devices that extend human senses. Things that cannot be observed or measured by current meanssuch as supernatural beings or eventsare outside the bounds of science. Consider these two questions about life on Earth:. Q: What term means anything that is detected either through human senses or with instruments and measuring devices that extend human senses? A: | OPTIONS:
- variation
- evaluation
- evacuation
- observation
A: observation

Q: Answer the following question given this paragraph: More recently, people have learned to process biomass to make fuel. This is called biofuel . Biofuel is created from crops, such as corn or algae. Biofuel is unique among renewable energy sources. This is because it is liquid. Unlike solar energy, for example, biofuels can be used in a car ( Figure below ). Biofuels burn more cleanly than fossil fuels. They create less pollution and less carbon dioxide. Biofuels, such as ethanol, are added to gasoline. This cuts down the amount of fossil fuels that are used. Q: What is biomass made into fuel called? A: | OPTIONS:
- benign fuel
- toxic fuel
- renewable fuel
- bio fuel
A: bio fuel