*Question*
Q: What is the process in which gases are exchanged between the body and the outside air?   Read this paragraph and choose the correct option from the provided answers:  Respiration is the process in which gases are exchanged between the body and the outside air. The lungs and other organs of the respiratory system bring oxygen into the body and release carbon dioxide into the atmosphere.   Choices:  - ingestion  - metabolism  - precipitation  - respiration   A:
**Answer**
respiration

*Question*
Q: What shape is the gametophyte in ferns?   Read this paragraph and choose the correct option from the provided answers:  In ferns, the sporophyte is dominant and produces spores that germinate into a heart-shaped gametophyte.   Choices:  - circular  - rectangular  - diamond  - heart-shaped   A:
**Answer**
heart-shaped

*Question*
Q: What involves the emission of a particle and/or energy as one atom changes into another?   Read this paragraph and choose the correct option from the provided answers:  Radioactive decay involves the emission of a particle and/or energy as one atom changes into another. In most instances, the atom changes its identity to become a new element. There are four different types of emissions that occur.   Choices:  - spontaneous mutation  - atomic transformation  - enthalpy  - radioactive decay   A:
**Answer**
radioactive decay

*Question*
Q: Changes in the number of what can lead to disorders like down syndrome?   Read this paragraph and choose the correct option from the provided answers:  Changes in chromosome number can lead to disorders like Down syndrome.   Choices:  - prokaryotes  - dna  - genes  - chromosomes   A:
**Answer**

chromosomes