Fact 1: Aplanet rotating causes cycles of day and night on that planet. Fact 2: The gravitational pull of the major planets alters the orbital period from revolution to revolution. Given the two facts above, what causes day and night?
OPTIONS:
- chemical messengers
- The moon
- The ocean's waves
- chemical reaction
- Revolution around the sun
- The clock on the wall
- Evaporation of water
- Basic units of the plant body.
Revolution around the sun

Fact 1: Most fungi get organic compounds from dead organisms. Fact 2: Fungi are heterotrophs that utilize organic matter. Given the two facts above, what uses organic compounds from dead organisms?
OPTIONS:
- fossil fuels
- swamp vegetation
- peachleaf willow
- Cooking
- it needs them
- Heterotrophs
- agriculture
- Most plants

Answer: Heterotrophs

Question: Fact 1: Lakes are formed by precipitation and runoff. Fact 2: For example, Lake Tahoe is a huge lake originating from mountain stream runoff. Given the two facts above, what does Lake Tahoe originate from?
OPTIONS:
- hydrogen and oxygen
- It's manmade
- An ocean
- tectonic plates coliding
- A hurricane
- A mountain stream
- Water expanding
- body water
Answer: A mountain stream

input with options: Fact 1: Echinoderms lack a centralized nervous system. Fact 2: Echinoderms include starfish, sea urchins, and sea cucumbers. Given the two facts above, starfish, sea urchins and sea cucumbers lack a what?
OPTIONS:
- characteristics
- the body's largest organ
- watery habitat
- centralized nervous system
- functioning arm
- underwater life
- biological diversity
- epidermis and dermis
output: centralized nervous system

Q: Fact 1: Damming a river can cause a lake to form. Fact 2: There is no spillway at Lake Tahoe Dam. Given the two facts above, what can affect the level of a lake?

OPTIONS:
- boat traffic
- flooding
- boat shipping
- erosion
- Pollution
- salinity
- over fishing
- spillways

A: spillways

Fact 1: Having no natural predators increases population size. Fact 2: Population size is a function of natality and mortality. Given the two facts above, having what is a cause of mortality?
OPTIONS:
- natural predators
- seasons
- Abnormal cell growth
- liver cancer
- insects
- chickenpox
- influenza
- sunlight
natural predators