Q: Fact 1: Ablack hole is formed by a high-mass star collapses. Fact 2: Essentially, a black hole is a gravity drain. Given the two facts above, what is formed by a high-mass star collapses?

OPTIONS:
- grave error
- an object
- a gravity drain
- mass grave
- deoxyribonucleic acid
- Physical weathering
- gravity depletion
- hydrogen and oxygen

A: a gravity drain

Q: Fact 1: Population size influences the chances of a species surviving. Fact 2: Economic migration affects the population size. Given the two facts above, what influences the chances of a species surviving?

OPTIONS:
- light energy
- migration
- plate tectonics
- cell division
- animals
- temperature
- environment
- erosion

A: migration

Q: Fact 1: Reproduction is the process by which living things give rise to offspring. Fact 2: Plants are also the oldest living things. Given the two facts above, what reproduces to give rise to offspring?

OPTIONS:
- fungi
- embryos
- mammals
- plants
- density
- clouds
- Flowers
- multiply

A: plants

Q: Fact 1: Riding a bike does not cause pollution. Fact 2: Air pollution can cause diseases and harm crops. Given the two facts above, what form of transportation does not cause diseases or harm crops? ?

OPTIONS:
- Earthworms
- animals
- automobile
- mechanical
- train
- airplane
- Movement
- bicycle

A:
bicycle