Answer the following question given this paragraph: Leaves are the keys not only to plant life but to all terrestrial life. The primary role of leaves is to collect sunlight and make food by photosynthesis. Despite the fundamental importance of the work they do, there is great diversity in the leaves of plants. However, given the diversity of habitats in which plants live, it's not surprising that there is no single best way to collect solar energy for photosynthesis. Q: What is the part of a plant whose primary role is to collect sunlight and make food by photosynthesis? A:

OPTIONS:
- roots
- stems
- seeds
- leaves

Answer: leaves

Answer the following question given this paragraph: Terrestrial biomes include the tropical rainforest, chaparral, and taiga. Q: Tropical rainforest, chaparral, and taiga are what kind of biomes? A:

OPTIONS:
- endangered
- arboreal
- freshwater
- terrestrial

Answer: terrestrial

Answer the following question given this paragraph: Q: What step, involving placement of a substance on the stigma, precedes fertilization? A:

OPTIONS:
- mitosis
- spawning
- hibernation
- pollination

Answer: pollination

Answer the following question given this paragraph: All the atoms of a given element have the same number of protons and electrons. The number of neutrons, however, may vary for atoms of the same element. For example, almost 99 percent of carbon atoms have six neutrons, but the rest have either seven or eight neutrons. Atoms of an element that differ in their numbers of neutrons are called isotopes. The nuclei of these isotopes of carbon are shown in the Figure below . The isotope called carbon-14 is used to find the ages of fossils. You can learn how at this URL: http://science. howstuffworks. com/environmental/earth/geology/carbon-14. htm . Q: How many neutrons do 99% of carbon atoms have? A:

OPTIONS:
- sixteen
- five
- eight
- six

Answer:
six