Were descended from similar birds in Africa.
Would become more similar over time.
Had become adapted to eating different diets.
Elephants and bacteria changed constantly.
Animals changed, but plants remained the same.
Species changed over time by natural selection.
Species changed over time and never competed with each other
Must be created in laboratories.
Can replenish themselves naturally.
Were never utilized until the 20th century.
Are manufactured from fossil fuels.
Organisms with traits well-suited to their environment reproduce at a greater rate than less well-adapted organisms in the same environment.
Change occurs in the genetic characteristics of individuals that live together in an environment from one generation to another.
Baseball players pass on the trait for strong arm muscles to children.
Use and disuse of a characteristic leads to evolutionary change.
There is little effect
The whole food chain dies out
Those higher in the food chain must find alternate sources of food; those lower in the food chain must be controlled by other consumers
Those higher in the food chain benefit; those lower in the food chain suffer
Susceptible to disease.
Challenging to survival.
Ten percent of the energy in the level above it.
50 percent of the energy in the level below it.
100 percent of the energy in the level below it.
Ten percent of the energy in the level below it.
The humidity and temperature it prefers
Its tropic level
Its number of chromosomes
When it reproduces
Is at the top of the energy pyramid.
Eats other organisms.
Converts the energy of sunlight into high-energy organic compounds.
Breaks down dead organisms into recyclable simple chemicals.