Fact 1: Plant reproduction often requires pollen. Fact 2: Hay fever or pollen allergy is the most prevalent allergy. Given the two facts above, plant reproduction often requires something that causes what?
OPTIONS:
- mutations
- bloom time
- An earthquake
- Steam
- seeds
- The common cold
- gene flow
- Allergies
Allergies
--
Fact 1: Earth 's tilt on its rotating axis causes seasons to change. Fact 2: Habitats change with the seasons. Given the two facts above, what causes habitats to change?
OPTIONS:
- global warming
- the environment
- fire conditions
- Earth's tilt on its axis
- To another location like underground
- looseness of dirt or compost
- deforestation
- a tree falling
Earth's tilt on its axis
--
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
A mountain stream
--
Fact 1: Muscle contraction occurs when muscle fibers get shorter. Fact 2: Muscle activation is a prerequisite for muscle contraction. Given the two facts above, what happens to fibers after muscle activation?
OPTIONS:
- It expands
- Localized damage
- It decreases
- get shorter
- they bend
- rapid expansion
- sweating
- movement
get shorter
--