Fact 1: Some birds are pollinators that co-evolved with plants. Fact 2: Hummingbirds are the most common bird pollinators. Given the two facts above, hummingbirds are what they are today as a necessary consequence of their relationship to what?

OPTIONS:
- a feeder
- humans
- bees
- survival
- animals
- Plants
- Earth
- weeds

Answer: Plants

Fact 1: Brain cells die quickly if their oxygen supply is cut off. Fact 2: Blood carries oxygen to the brain. Given the two facts above, brain cells die quickly if their what supply is cut off?

OPTIONS:
- energy
- breathe
- Energy.
- alveoli
- cut
- CO 2
- loss
- blood

Answer: blood

Fact 1: Prokaryotes are single-celled organisms that lack a nucleus. Fact 2: Prokaryotes All bacteria are prokaryotes. Given the two facts above, what are single-celled organisms that lack a nucleus?

OPTIONS:
- Leeuwenhoek
- orchids
- Most plants
- barnacles
- PDAs
- bacteria
- cacti
- ferns

Answer: bacteria

Fact 1: Preventing the transfer of heat from an organims 's body causes that organism to keep warm. Fact 2: Leaves can keep animals warm. Given the two facts above, how do leaves keep animals from getting cold? ?

OPTIONS:
- can be worn as clothes
- protect them
- adapt to coolness
- heat with the sun
- used to start fires
- hard outer covering
- preventing heat transfer
- A transportation fuel

Answer:
preventing heat transfer