*Question*
Q: Bacteria can be chemotrophs, which obtain what by breaking down chemical compounds in their environment? Read this paragraph and choose the correct option from the provided answers: Bacteria can also be chemotrophs. Chemosynthetic bacteria, or chemotrophs , obtain energy by breaking down chemical compounds in their environment. An example of one of these chemicals broken down by bacteria is nitrogen-containing ammonia. These bacteria are important because they help cycle nitrogen through the environment for other living things to use. Nitrogen cannot be made by living organisms, so it must be continually recycled. Organisms need nitrogen to make organic compounds, such as DNA. Choices: - waste - chemials - food - energy A:
**Answer**
energy

*Question*
Q: What causes genetic disorders in humans? Read this paragraph and choose the correct option from the provided answers: 15.4 Alterations of chromosome number or structure cause some genetic disorders. Choices: - variations of chromosome - alterations of genes - pollutants of chromosome - alterations of chromosome A:
**Answer**
alterations of chromosome

*Question*
Q: What process refers to the changes that occur in populations of living organisms over time? Read this paragraph and choose the correct option from the provided answers: The term evolution describes the changes that occur in populations of living organisms over time. Describing these changes does not address the origin of life. The two are commonly and mistakenly confused. Biological evolution likewise says nothing about cosmology, the Big Bang, or where the universe, galaxy, solar system, or Earth came from. Choices: - spontaneous mutation - adaptation - variation - evolution A:
**Answer**
evolution

*Question*
Q: The pollen grain absorbs water and does what after it adheres to the stigma of a carpel? Read this paragraph and choose the correct option from the provided answers: Choices: - reproduces - dissolves - blooms - germinates A:
**Answer**
germinates